the anatomy looks outstandingly weird in this picture.

Tiny body, hueg ass.

as well as huge, misshapen head and miniscule feet.

Yeah, I know out-of-proportion bodies are a no-no, but I wasn't sure if it being a somewhat rare character to find hentai for and it being hentai in the first place, plus the quality of the art outside awkward proportions, offset the issue. Especially since it makes me think chibi/DS look more than bad art.

Her ass isn't huge. It's merely present, is all.

Other than the toes on her right foot, I don't see a problem.