First attempt for an Illustrious XL style. Mostly anime-focused.

USE PROMPTS BELOW. CFG 4.5-7

beginning of positive prompt:

masterpiece, best quality

You can use detailed as an additional tag.

negative prompt:

lowres, (bad), bad anatomy, bad hands, extra digits, multiple views,fewer, extra, missing, text, error, worst quality, jpeg artifacts, low quality, watermark, unfinished, displeasing, oldest, early,chromatic aberration, signature,artistic error, username, scan

or:

lowres, worst quality, low quality, bad anatomy, bad hands, multiple views, 4koma,jpeg artifacts, patreon logo, patreon username, web address, signature, watermark, text, logo, artist name, overly saturated, overly vivid

I recommend AAAAAA, Obsession or SilvermoonMix versions of Illustrious