nice wallpaper
ok. here comes the critic^^: because the texture that the chara has, he doesn't fit in. and the extraction could be
beter, you should use the pen tool.
there is too much fog on the right side and even without that the fog looks strange, the buildings in the back need more
work because they don't even have the shape of a building, and i don't know what the black square on the left
is suposed to represent.
the planet on the left looks like it would be pasted in and the two on the right look good but they don't fit with
the color, you should make the sky a bit more colorfull on that side.