From what I can see,this is a really cute wall...but I have a few things to mind too
First:I don't like the little white flakes...they doesn't look like snow at all and I think you tried to make
a snowy wall...sorry if I'm mistaken...go to deviantart and get some cool brushes for snow there...they helped me a
lot of times,hehe :D
Second,the clouds in the bg look like just brushes and nothing more...try to make them more realistic by adding blur and
playing with colors...use burn and dodge tool too...
and add some gradient in the bg...it would look better...
Well,sorry if I was a little too strict...I just like to suggest people things that helped me making better walls hehe
;)
But,I really like the choice of the pic though,as well as the vector itself :D
The bg is what needs work,and that's always something the most complex...in my opinion :D