The artistry is amazing. The movie is directed by Naohisa Inoue who did the "Whisper of the Heart" backgrounds on the fantasy scenes (which has a similar feel). His paintings commonly take place in the land of Iblard (hence the name). Since he uses his actual paintings the backgrounds look great. An additional bit of info, it looks like his technique is similar to Sachiko's in "From Up On Poppy Hill" http://www.iblard.com/english/draw.html
To give the paintings life water effects are added over and other little things, the problem is everything sticks out like a sore thumb. Also they make all the paintings move to
make it seem like you are actually in the world, but it ends up extremely clunky and flat. The animation is so distracting that I spent more time looking up the paintings than actually watching the movie.
There is no story so nothing to judge.
There are no characters so nothing to judge.