My own internet searching turned up a few studies indicating that some chimpanzees were able to recognize images in human works of art. When chimpanzees tried to draw on their own, they drew "hooks" and "squiggles", but that was about the extent of chimpanzee drawing I found. One researcher (probably looking for something to say) commented that chimpanzee drawings tended to be clustered on the bottom part of the page. I don't think chimpanzees are doing anything that we would call representational.