More impressive, because of how good it is at capturing and synthesizing a wide variety of topics in a reasonably coherent way, and how it seems like it would actually be a viable mechanism for creating actual artwork, or at the very least, a source of inspiration for a human artist to touch-up on later.
Less impressive, in that it's pretty obvious it's not any more advanced than a graphical version of GPT-2, which is parroting content and styles that it has basically memorized and is really good at interpolating between.
Because there's no such thing as a "logical contradiction" in this sort of illustration, compared to a paragraph of text or a code listing, the fact that it's just interpolating between a huge database of memorized content isn't as easy to spot as with GPT-2, and matters less in the actual end result.