Resource :: ADetailer
ADetailer, also known as After Detailer, is an extension for the Stable Diffusion Automatic1111 web interface that automates tasks like inpainting and improves the generated images, particularly in the areas of faces and hands.
Mostly faces... It struggles with hands. But results with the faces are so good the "Restore Faces" option is not default anymore for A1111.
It works fine for realistic, fantasy or anime models and is especially useful at low resolutions.
A must have extension!
Link to ADetailer for A1111 (GitHub)
How to install/use
Everything you need to know is available on the GitHub page.
Stable Diffusion Art provides once again an extended and well written guide.
You can also ask Gemini.