For me the giveaway in some of them were that the computer-generated ones were "from a photograph". So, the woman with the hair up in an impossible position was

For me the giveaway in some of them were that the computer-generated ones were "from a photograph". So, the woman with the hair up in an impossible position was a human-generated one [1], for example. Also, the ones that looked more photograph-like were also computer generated. For instance, compare [2] and [3] [1] http://turing.deepart.io/t/4.jpg http://turing.deepart.io/t/4.jpg [2] http://turing.deepart.io/t/1.jpg http://turing.deepart.io/t/1.jpg [3] http://turing.deepart.io/f/3.png http://turing.deepart.io/f/3.png