Interesting wall. The transtion from light to dark could have been a bit smoother, mainly in the center botttom area of the wallpaper. The clouds on the night side of the wall could have been darker since it's a bit unatural for the clouds at night to be so light coloured.
I do agree with you though. The scan looks pretty ^^ But the tips of her hair on the left side look too blurred. I'm not a big fan of how you placed the clouds around her clothing that sticking out of the cloud. A ribbon, possibly? Overall, that area needs a bit more work. Other than that, it's a fine wallpaper ^^ Keep it up!