At the start of a positive prompt, I highly recommend adding the word: newest
At the start of a negative prompt, I highly recommend adding the word: oldest
If not using Textual inversion (embeddings) in positive prompt, always append at end of positive prompt: masterpiece, best quality
If not using Textual inversion (embeddings) in negative prompt, always append at start of negative prompt: 3d, worst quality, bad quality, low quality, lowres, blurry, censor, bad anatomy, deformed

Style modifiers:

For realistic images append at end of prompt: artstation, realistic
For 2D / anime images append at end of prompt: anime screencap, anime coloring

Textual inversion (embeddings): Use lazypos (positive) and lazyneg (negative) from janxd to steer style via textual inversion embeddings. (Recomendation)

Sampler & settings:

Sampler: DPM++ 2M Karras
Steps: 30.
Guidance (CFG scale): 2.

Resolution: 1024 × 1536 or any resolution with 1024 width or height.

VAE: Skip using VAE; built-in backend already handles it.

Model base: WAI-NSFW-illustrious-SDXL v14