I like the colors and the composition of your wallpaper, it's pretty stylish and neat. The only thing I'd suggest would be to use shape layers for vectoring instead of paths - the lines in your wall are kind of too blurry in places (I'm guessing you were using a 2px or 3px brush for lineart) instead of crisp. Also, it makes the hair look dead with those blunt ends. Working with paths is easier and quicker, yes, but you get better results with shape layers - more dynamic and crisp looking lines you can tweak any way you want.
Keep it up!
