Here the link of the official tool: https://github.com/lllyasviel/Fooocus

Tuto install: https://www.youtube.com/watch?v=j1WuQndmgFE&list=PLSofK8pvSk5oHH9iNAAemQREADEY7CPp_

Tuto folders : https://www.youtube.com/watch?v=GgEEb2K0j7s

Tuto inpaint: https://www.youtube.com/watch?v=jlxabL3vRTY&list=PLSofK8pvSk5oHH9iNAAemQREADEY7CPp_&index=8

Tuto inpaint : https://www.youtube.com/watch?v=A_OuBpIZ8Dg

To do good fakes you will need these:

checkpoint : https://civitai.com/models/277058?modelVersionId=1074830

loras :  https://civitai.com/models/86483/retro-big-naturals-photorealistic-natural-boobs

For loras, you will need to adjust the level to improve the effect that you are looking for.

For more informations read the descriptions of your loras and checkpoints from Civitai.

Civitai is the main database where you can find your happiness to custom Fooocus and other tools like ComfyUI.

This is actually the most simple tool and only based on SDXL

if you want try SD 3.5 or Flux 1.D you will need to use ComfyUI and learn how to setup it but if you have a real PC then you will get a perfect result ;)