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ilkerzgi
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face-swap

Image-to-Image
Diffusers
Safetensors
lora
face-swap
flux
flux-2-klein
fal
image-generation
Model card Files
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Face-Swap LoRA for FLUX 2 Klein 9B

Prompt
face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.
Prompt
face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.
Prompt
face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.
Prompt
face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.
Prompt
face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.
Prompt
face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.

A LoRA adapter for FLUX 2 Klein 9B fine-tuned for high-quality face swapping. Given a face source image and a body/scene image, the model produces a natural face swap preserving identity, lighting, and skin tone.

Prompt

Use the following prompt for best results:

face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. the result should show the exact face and features from Picture 1 on the body, pose, and scene from Picture 2, with natural skin tone blending and matching lighting.
  • Picture 1: Face source image (the identity to transfer)
  • Picture 2: Body/scene image (the target pose and environment)

How to Use

Try it on fal

Open on fal.ai

Via fal.ai API 

import fal_client

def on_queue_update(update):
    if isinstance(update, fal_client.InProgress):
        for log in update.logs:
           print(log["message"])

result = fal_client.subscribe(
    "fal-ai/flux-2-klein/9b/base/edit/lora",
    arguments={
        "prompt": "face_swap: take the face from Picture 1 and swap it onto the person in Picture 2. "
                  "the result should show the exact face and features from Picture 1 on the body, pose, "
                  "and scene from Picture 2, with natural skin tone blending and matching lighting.",
        "model_name": None,
        "loras": [{
            "path": "https://huggingface.co/ilkerzgi/face-swap/resolve/main/FS2_V2_r32_800_pytorch_lora_weights.safetensors",
            "scale": 1
        }],
        "embeddings": [],
        "image_urls": [
            "https://example.com/face_source.png",
            "https://example.com/body_scene.png"
        ],
        "num_images": 4
    },
    with_logs=True,
    on_queue_update=on_queue_update,
)
print(result)

Evaluation Overview

Test Cases LoRA Variants Image Models Total Generations Dataset Sizes
25 9 3 300 300 / 800

9 LoRA variants were trained with different hyperparameters and evaluated against 3 image models across 25 diverse test subjects.

Training Configurations

Variant Samples Rank Steps LR Guidance Avg Latency
V1 r16 (300) 300 16 3000 5e-5 1 6.0s
V2 r32 (300) 300 32 3500 5e-5 1 6.1s
V3 r32+cfg (300) 300 32 3500 5e-5 3.5 6.6s
V1 r16 (800) 800 16 3000 5e-5 1 6.4s
V2 r32 (800) 800 32 3500 5e-5 1 6.3s
V3 r32+cfg (800) 800 32 3500 5e-5 3.5 6.2s
V4 r32 long (800) 800 32 5000 5e-5 1 6.4s
V5 r64 (800) 800 64 4000 3e-5 1 6.4s
V6 r32 slow (800) 800 32 5000 1e-5 1 6.4s

Image Models

Model Avg Latency
Nano Banana 2 28.8s
Nano Banana Pro 33.3s
GPT Image 1.5 30.3s

Latency Comparison

Model Avg Latency
V1 r16 (300) 6.0s
V2 r32 (300) 6.1s
V3 r32+cfg (800) 6.2s
V2 r32 (800) 6.3s
V6 r32 slow (800) 6.4s
V4 r32 long (800) 6.4s
V5 r64 (800) 6.4s
V1 r16 (800) 6.4s
V3 r32+cfg (300) 6.6s
Nano Banana 2 28.8s
GPT Image 1.5 30.3s
Nano Banana Pro 33.3s

All LoRA variants average ~6-7s, while image models average ~29-33s.

Model Weights

Variant Rank Samples Download
V1 r16 (300) 16 300 FS_V1_r16_300_pytorch_lora_weights.safetensors
V2 r32 (300) 32 300 FS_V2_r32_300_pytorch_lora_weights.safetensors
V3 r32+cfg (300) 32 300 FS_V3_r32g_300_pytorch_lora_weights.safetensors
V1 r16 (800) 16 800 FS2_V1_r16_800_pytorch_lora_weights.safetensors
V2 r32 (800) 32 800 FS2_V2_r32_800_pytorch_lora_weights.safetensors
V3 r32+cfg (800) 32 800 FS2_V3_r32g_800_pytorch_lora_weights.safetensors
V4 r32 long (800) 32 800 FS2_V4_r32L_800_pytorch_lora_weights.safetensors
V5 r64 (800) 64 800 FS2_V5_r64_800_pytorch_lora_weights.safetensors
V6 r32 slow (800) 32 800 FS2_V6_r32s_800_pytorch_lora_weights.safetensors

Test Cases (25)

#1 — middle-aged woman with short stylish grey hair and blue eyes, elegant bone structure

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 6.7s 8.9s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
7.3s 6.6s 6.6s 6.6s 6.6s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
35.3s 39.6s 27.7s

#2 — young woman with long straight brown hair parted in the middle and brown eyes

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
6.6s 6.1s 7.1s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 7.1s 6.8s 7.1s 9.4s 6.8s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
24.0s 32.5s 44.6s

#3 — older woman with short white curly hair and warm brown eyes

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
6.1s 6.3s 5.9s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.6s 6.6s 6.6s 6.6s 6.6s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
25.0s 30.4s 50.6s
#4 — young African American woman with braided hair and warm brown eyes

#4 — young African American woman with braided hair and warm brown eyes

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
7.5s 7.4s 5.8s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.6s 6.6s 7.6s 6.6s 5.7s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
31.0s 36.6s 28.0s
#5 — young woman with short blonde bob haircut and bright blue eyes, Scandinavian features

#5 — young woman with short blonde bob haircut and bright blue eyes, Scandinavian features

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.7s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
8.0s 6.6s 6.1s 6.7s 6.9s 5.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
26.5s 41.0s 25.3s
#6 — young Hispanic man with wavy dark hair and brown eyes, trimmed goatee

#6 — young Hispanic man with wavy dark hair and brown eyes, trimmed goatee

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.7s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.1s 7.1s 6.1s 6.6s 6.6s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
25.4s 42.3s 24.0s
#7 — young South Asian man with dark thick hair and brown eyes, short neat beard

#7 — young South Asian man with dark thick hair and brown eyes, short neat beard

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 6.6s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.6s 6.6s 6.6s 7.1s 7.5s 7.1s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
23.0s 31.3s 25.4s
#8 — young man with a buzz cut and hazel eyes, tanned skin

#8 — young man with a buzz cut and hazel eyes, tanned skin

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
6.2s 6.6s 6.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.1s 6.6s 6.6s 6.8s 5.5s 5.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
28.5s 39.8s 26.6s
#9 — young Middle Eastern man with dark wavy hair and olive skin, prominent eyebrows

#9 — young Middle Eastern man with dark wavy hair and olive skin, prominent eyebrows

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.9s 6.6s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.1s 7.3s 8.9s 6.6s 5.7s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
25.3s 44.6s 66.6s
#10 — young man with curly black hair and deep brown eyes, clean-shaven

#10 — young man with curly black hair and deep brown eyes, clean-shaven

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
6.4s 5.7s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 7.1s 6.1s 7.0s 6.7s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
43.9s 31.3s 25.2s
#11 — young African American woman with short natural TWA hairstyle and dark brown eyes, high cheekbones

#11 — young African American woman with short natural TWA hairstyle and dark brown eyes, high cheekbones

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 6.7s 6.6s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
9.8s 7.5s 5.7s 6.6s 6.1s 7.5s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
26.1s 23.3s 25.3s
#12 — young woman with tight blonde curls, dark brown skin, bright smile, dimples

#12 — young woman with tight blonde curls, dark brown skin, bright smile, dimples

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.4s 10.3s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 5.7s 6.1s 6.6s 6.2s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
30.6s 25.8s 25.4s
#13 — young woman with tight blonde curls, dark brown skin, bright smile, dimples

#13 — young woman with tight blonde curls, dark brown skin, bright smile, dimples

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
7.1s 5.7s 7.0s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 6.6s 5.7s 7.0s 5.8s 6.8s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
24.1s 24.4s 26.6s
#14 — middle-aged woman with dark skin, close-cropped natural hair, elegant gold jewelry

#14 — middle-aged woman with dark skin, close-cropped natural hair, elegant gold jewelry

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 7.1s 7.5s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
7.1s 5.7s 7.1s 5.7s 7.1s 7.1s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
19.4s 24.7s 28.1s
#15 — young Nordic man with platinum blonde hair, ice blue eyes, sharp cheekbones, clean shaven

#15 — young Nordic man with platinum blonde hair, ice blue eyes, sharp cheekbones, clean shaven

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.7s 6.6s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.6s 5.7s 5.7s 5.7s 7.5s 7.1s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
26.4s 42.2s 25.3s
#16 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face

#16 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.7s 10.3s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.4s 5.7s 5.7s 7.5s 7.1s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
45.2s 34.2s 24.0s
#17 — young Pacific Islander woman with long wavy dark hair, brown eyes, strong features

#17 — young Pacific Islander woman with long wavy dark hair, brown eyes, strong features

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.7s 7.1s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 8.1s 5.7s 5.7s 5.7s 6.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
20.0s 28.0s 27.3s
#18 — older Eastern European man with a thick grey mustache, lined face, piercing grey eyes

#18 — older Eastern European man with a thick grey mustache, lined face, piercing grey eyes

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.9s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 5.7s 5.7s 5.7s 5.7s 5.2s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
20.7s 24.0s 26.7s
#19 — older African American woman with silver locs, deep brown eyes, and laugh lines, regal posture

#19 — older African American woman with silver locs, deep brown eyes, and laugh lines, regal posture

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
6.2s 6.1s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 5.9s 5.7s 5.7s 5.7s 6.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
25.7s 58.2s 24.8s
#20 — older Chinese woman with jet black dyed hair, round face, gentle brown eyes, pearl earrings

#20 — older Chinese woman with jet black dyed hair, round face, gentle brown eyes, pearl earrings

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 6.6s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.8s 5.7s 5.7s 7.1s 5.6s 5.6s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
35.0s 27.9s 28.3s
#21 — middle-aged woman with fiery red curly hair and freckled pale skin, green eyes, strong jawline

#21 — middle-aged woman with fiery red curly hair and freckled pale skin, green eyes, strong jawline

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.6s 5.7s 5.6s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 5.7s 5.7s 5.7s 6.6s 5.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
41.1s 36.6s 27.9s
#22 — young Southeast Asian man with black hair, smooth brown skin, sharp jawline

#22 — young Southeast Asian man with black hair, smooth brown skin, sharp jawline

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.7s 5.7s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 5.7s 6.6s 5.7s 5.7s 5.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
25.3s 28.8s 25.3s
#23 — middle-aged woman with natural grey afro, dark skin, reading glasses on nose

#23 — middle-aged woman with natural grey afro, dark skin, reading glasses on nose

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
6.6s 5.7s 5.7s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
6.1s 5.7s 5.8s 5.6s 6.6s 5.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
34.1s 22.0s 24.6s
#24 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face

#24 — middle-aged Hispanic woman with dark wavy hair streaked with grey, warm brown eyes, round face

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
5.6s 5.7s 6.1s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
7.8s 5.7s 5.9s 5.7s 5.7s 5.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
31.9s 24.7s 26.0s
#25 — older East Asian man with thinning grey hair, wire-rimmed glasses, kind wrinkled eyes

#25 — older East Asian man with thinning grey hair, wire-rimmed glasses, kind wrinkled eyes

Face Source Body / Scene Ground Truth

LoRA — 300 Samples

V1 r16 (300) V2 r32 (300) V3 r32+cfg (300)
6.6s 5.7s 6.0s

LoRA — 800 Samples

V1 r16 (800) V2 r32 (800) V3 r32+cfg (800) V4 r32 long (800) V5 r64 (800) V6 r32 slow (800)
5.7s 5.7s 5.4s 5.7s 5.7s 5.7s

Image Models

Nano Banana 2 Nano Banana Pro GPT Image 1.5
25.3s 37.3s 46.7s

Training Details

  • Base Model: FLUX 2 Klein 9B
  • Method: LoRA (Low-Rank Adaptation)
  • Trainer: fal-ai/flux-2-klein-9b-base-trainer
  • Datasets: Two custom face-swap paired datasets (300 and 800 samples)
  • Rank variants tested: 16, 32, 64
  • Training steps: 3,000 – 5,000
  • Learning rates: 1e-5 to 5e-5
  • Guidance scale: 1.0 and 3.5

Author

Ilker Izgi — Creative Engineer at fal

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