I'll say the obvious before anyone else has to say it.

Three words...too much white. I don't mind the clean approach I think you are trying to take but honestly, it's way too empty. The whole lot of white makes that wallpaper feel clinical and dead instead of giving of the "happy times" feeling I think I'm supposed to feel.

I would try for a simple patterned background maybe and use the original colours for the four characters on the side.

He was very simple its to wallpaper, I find qe it would be with umarpecto better if you left the girls with the orginais colors and worked a little more the deep one, because in the way that this leaves to seem that to wallpaper this empty

Let me just say, I love the placement you used. The composition is very good and balanced.

However, I might suggest that you make the characters/figures a different color, preferably one that shows up in other parts of the wallpaper (red/black).

I feel that this change would make the wallpaper more pleasurable to the eye. =)

Looks very nice. I'm a big fan of less is more, however it seems a little blurry to me. Maybe save it under a higher resolution?

I like the large amount of white/empty space. Its nice and simple. Though others might not like that, its just what I'm looking for.

Quite nice for something so easily done.