I thought it was easier to tell which ones were computer generated rather than which were painted by a human. The computer art all seem rather abstract yet uniform.
also the high-fidelity, near-photographic paintings are always human.
I was only 3/10 - so I think it takes an eye for art to beat it. In my mind this is like a chess program getting to 1200. Not enough to beat an expert, but it's on to something.
I am convinced intelligence programming will tackle these issues some day. But apparently not yet.