Recommended settings: (use whatever you like, these work for me)
Sampling method: Euler Ancestral
Sampling steps: 30
Schedule Type: Automatic / DDIM
CFG Scale 5 - 7
Recommended positive prompt:
masterpiece, best quality, amazing quality, (all the rest of the stuff)
recommended negative prompt:
bad quality, worst quality, worst detail, sketch, text, signature, logo, username,
No need for overly long negative prompts, they just tend to make the quality worse. If you want something out of the picture, put it here, otherwise, can almost be left empty.