I've measured the "realism" of graphics in terms of resolution for many years now, because nowadays we generally have realistic graphics, as long as the resolution is small enough. (Compare with, say, an NES game, where no matter what you do to that image nobody will ever find it realistic.) There's a lot of techniques/artists/etc. I've seen that are perfectly realistic looking at 320x200 (say), but couldn't sustain the illusion of realism at 1920x1080. This way I get a reasonable metric of whether or not graphics are "photorealistic", or in this case, match the style of the painting.

It would be interesting to see them do a higher resolution version, or if they have them. It's possible it would indeed fit right in even so; now that I think about it the microscale of these paintings are probably very stereotypical and the algorithm might be able to reproduce them well. It would be especially interesting to see if it would correctly reproduce brush strokes, which have a lot of context to them. Given that "deep learning" can do things like reproduce the structure of a TV script accurately, it doesn't seem out of the question.