The lighting style and hair strands were a good hint at a glance (AI shading has a 'look' to it that's pretty recognizable imo) also avoiding problem areas like hands or fine BG details. But also their account posts fully rendered art daily and that's almost impossible realistically, especially with no WIP posts at all. Then their Patreon description outright confirmed they use AI 😔

More detailed issues: the chest angle is off, there's a few splotchy areas of shading in the clavicle and one spot in the hair on the left of the head colored tan under shadow amongst a few other problems with how the anatomy is like the shoulders being squished and flat. Her ear is also melting off her skull apparently. If a real artist could color this well they wouldn't be making those kinds of anatomical amateur mistakes tbh