That I’ve stumbled onto the last couple weeks. The Bottom — who actually has a horse-head that, in the dark, could maybe be a cow elk — is from the manga A Midsummer Night’s Dream done by Kate Brown, and the deer-woman’s from Carmen Maria Machado’s The Low, Low Woods. Presumably she wrote something like ‘deer/human monster, female,’ and then Dani, the artist, realized it:

is the author of 23 or 25 or so books, +300 stories, some comic books, and all this stuff here. He lives in Boulder, Colorado, and has a few broken-down old trucks, one PhD, and way too many boots