Look closely, generaly in the the detailed areas (the moon on the staff and the halo like thing). Parts of the scan you
extracted the image from are still there; like a thin outline around the parts of the halo. Just look closely. Other
parts of the scan have the same problem. All ya gotta do is look closer.
The huge white cloud underneath the girl could use a bit volume and depth. Unless you want it to look like a really bright looking cloud. But compared to the other clouds it's a bit out of
place. So try adding some grey to that very white cloud to give it just that.
And as for the clouds in the background, they're in pretty bad quality. Take these areas for example:
The areas circled in red are the most obvious spots on your wallpaper. If you can't see what I'm talking
about, look closer, because there are visiblie lines you'll see that indicates a change of colour. If you were
making a vector wall, this would be alright. But your not, so this would be a no, no. Try bluring them out to make the
colours blend more. That's what I would do...
After those adjustments I recommended, this wall should stay in the galleries if you re-subbmit it.