Wow, the background looks stunning! Beautiful mountains and clouds.

Anyways, seeing everyone praise this wallpaper, let me be an asshole and give it some critic
No seriously, the lightning and shadows are pretty off, although the avarage viewer won't even notice. First of all there's the problem with the character, which in the scan seem to have some light coming from the top-left (causing all the basic shadows on the character), plus some hard light coming from the explosion behind her (causing the black clothes to be pitch black). In this snowy mountain scene, none of those lights are retraceable. Instead, judging on the dark areas on the mountains, the sun stands somewhere on the top right. And for some reason the shadow of the character on the snow is directed to the top left. That would mean there's a light 'behind the camera'. If this were the case though, the legs would've been lit properly and not turn pitch black like they are now.

As said though, the avarage viewer won't even notice, but I have to work a lot with composition, lights and shadows for my study, so I'm always a sucker for those things ;)

So my tip for your next wall, if again combining a different bg with an extracted character; visualize the light sources. And you could always ask me :D

Last words: don't take my rambling too serious, you're making kick-ass stuff here ;)

...excelent background... nice design...

...good work...

congrats!='.'=