This is certainly interesting research, and as an artist I think I'd be hugely frustrated by the amount of non-local change which seems to happen in the video. A fair number of small pen strokes seem to affect a large part of the generated face.

For example, take the difference between 2:20 and 2:27 in the video. The upper half of the drawing hasn't changed, but the generated image has a lot more hair and different ears. While the technology looks impressive as it is, it seems to me that it would be better to leave areas the artist has barely defined as blurred rather than flickering between various high resolution features that are all roughly equally matching the sketch.