I think this artist might be AI.

The eyes and eyelashes on that Kayoko look a bit mushed, but I think it's even more obvious on these two other artworks of theirs:
https://www.pixiv.net/en/artworks/142778825
https://www.pixiv.net/en/artworks/141504638

I agree it looks like AI. Above aside, it's missing the mole, the pupils are misshapen and her breasts are too large. The skin is too "clean", the buttons have seemingly random patterns on them and the top button of the shirt instead has two empty button holes on each side.

Individually this isn't any sort of proof, but together it raises some suspicion.

Real artists omit Kayoko's mole and give her larger breasts than usual very, but the buttons are a good artifacts to point out.

If no one has any counter-arguments, then these should be flagged and tagged as AI.