I got 6/10. I guessed that most of the things that looked "too real" were based on photos with filters applied to make it look like a painting, and that the abstract stuff was generated by humans. E.g. I was very surprised a computer produced this: http://turing.deepart.io/f/0.png or this http://turing.deepart.io/f/4.png
But the opposite heuristic doesn't work either, because not all the computer paintings are abstract. It mimics a lot of different styles and I am extremely impressed.
>I guessed that most of the things that looked "too real" were based on photos with filters applied to make it look like a painting, and that the abstract stuff was generated by humans.
I too used the same method and 5/10. Looking at the other comments, it seems people have better idea what art is than I do.
But the opposite heuristic doesn't work either, because not all the computer paintings are abstract. It mimics a lot of different styles and I am extremely impressed.