Something about the scan makes it look as though it was poorly constructed. I'll try to point them out, each one and hopefully you can work on this to make it even more perfect.

- there are several overexposures in the hair, particularly in the girl's bangs. They look so neon that it distracts me from looking at the nice side of the wallpaper.
- the scan's eyes are dead. they aren't conveying as much as the original scan because you made it too saturated. i would have suggested that you made it more bluish and gave it smoother edges.
- the wall is technically dead due to the saturation, not to mention the blue makes this even more convincing, and its ironic since the scan is in a position that it should convey happiness, but the colors are poorly done.
- the clouds could use just a little more shadowing, and less flares. that way, its not so strikingly off.

HOWEVER, the overall wallpaper is pretty commendable. I LIKE the fact that the scan is a non-conformist. Meaning to say, you do not find such an awkwardly positioned scan in wallpapers these days that managed to still pull it off quite well. I also commend the planet, I like how its textures are done as well as the several fractals that were involved in the creation of your wallpaper. So overall, its a pretty neat wall job.

The image is perfect! Without no noise. He was excellent its to wallpaper. My congrats.