Ooo, This one is spooky. I recognize modern horror images, but I expect classical one to be 1) close to real life, or 2) kind of a heavenly, angelic or even demonic bent. This one looks like it was intended as a portrait. Ouch!
https://en.wikipedia.org/wiki/Gabriel_von_Max
"Gabriel Max kept a herd of monkeys from 1869 to about 1873, which he photographed and sketched. Later he used the material for large paintings in which he sometimes depicted the animals as people."