In trying to find out who 織花 is, I found sophie 91919, a Taiwanese artist who goes by that name and has a style that looks like a match, but hasn't posted anything about either of these two franchises on their Pixiv or Threads account - maybe they have a Bilibili account or something, but I can't find it

EDIT: Found this artist's commission spreadsheet and it lists several commissions from Sane, this Pixiv user, so I'm going to ahead and tag em