The sky brushes look pretty, and so do the trees, though you could use some more work with your scenic walls, although i already know you dont read any of my tips but anyways^.^

Some shadowing could be done on the grass since the scan is sitting there in the grass. Seems a bit of out place cuz the scan doesnt quite match the scenery around her because for one the scan does look detailed, so it would make sense to make a more detailed background as well to fit it^.^

i think this wall is done pretty well. not much wrong with it. althought there is still a few things
a) the trees look a little off. they're a bit too blurry and dark for the rest of the wall. i dont know if you were going for contrast or what but they should reflect what the rest of the wall is about. light and vibrance.
b) i dont think that planet next to the moon is necessary. it looks like you've just put it in there because you can.
c) there is also a lot of empty space. something like a pasture with cows and horses grazing would've been nice to see. althouh that would've been pretty hard to do.

wow really nice wallie and the background is great

excelent wall

Really nice! It has a really peaceful feeling!
I love it!
Awesome job!