This workflow is used for upscale and face swapping (based on the Flux model).

Tutorials：

https://www.youtube.com/watch?v=vBaB_YmoZ-0

Tips：

If your computer's performance is limited and it cannot directly generate a high-resolution image, you can first generate a low-resolution image and then upscale it.

Flux Models:

Black Forest's schnell model: https://huggingface.co/black-forest-labs/FLUX.1-schnell/tree/main

Black Forest's dev model: https://huggingface.co/black-forest-labs/FLUX.1-dev/tree/main

Comfy Org's dev model: https://huggingface.co/Comfy-Org/flux1-dev/tree/main

Comfy Org's schnell model: https://huggingface.co/Comfy-Org/flux1-schnell/tree/main

Kijai's dev and schnell models: https://huggingface.co/Kijai/flux-fp8/tree/main

Custom Nodes Used:

ReActor:  https://github.com/Gourieff/comfyui-reactor-node

UltimateSDUpscale:  https://github.com/ssitu/ComfyUI_UltimateSDUpscale