Image looks nice, not very artistic, but.... you took a picture of an unsolved rubiks cube. Surely there must be some sort of rule against this unless you're trying to photograph frustration incarnate.
Great idea, maybe a black basckground would have worked a bit better because of the white squares blending in with the white background. I know, just a little thing.
Nice idea - I have one of these sitting at my desk, but it is so worn out that I can hardly tell the colors on it!
I am not so sure about the symmetry on this one. If you had rotated the cube slightly ccw, and took a shot from a lower point, i.e. to show more of yellow side, that might have worked better.This way, other colors are too distracting, taking away from the yellow impact.
Another thing that catches my attention in somewhat negative manner are the two white fields that seem to have no border on the outside. Your post processing probably hid those.
I still like it - solid 6