The problem with that one is that all the artists are technically apes too (https://en.wikipedia.org/wiki/Ape).

I got 100% on this one. I looked at all of them before making my selections and found what seemed to be a pattern amongst the ape ones.

Yeah, that seems like the trick. The ape ones are really very similar to each other.

100% on this, and found it pretty easy to tell the difference. The main 'tell' was that the ape images had individual brushstrokes that were erratic in thickness/pressure/amount of paint, whereas the individual strokes in the artist images were generally more consistent.