Knowing upfront that one is computer generated does not really work nor showing it to an audience that has seen deep neural net pics for months on the frontpage of HN. Showing them on the street in a non tech neighborhood and ask which is the better/nicer looking painting without saying that one is done by a computer should get some better results.

Prepare for some people actually getting angry about it once you tell that the paintings they liked most are computer generated (from pictures but still).