the clouds are just stunning o.O
since you don't mind criticism~ *ehem*
the relatively light background kinda clashes with the girl and it's kind odd with those white foot tracks, maybe
it's best to remove them? =D
and i think you should make the girl more emm.. 'darker' so she blends with the whole thing, unless if you want her to stand out of course.
it's kinda hard to tell which is the main focus, the girl or the clouds? the clouds are a bit distracting in my opinion.
that's all i can say about this wallie, overall of all the criticism i jsut wanna say you did an excellent job and i'm pretty sure you worked hard on it? ;D
goo knight-chan! *w*