I'm going to have to go with Kuryuki as well,
sasuke doesn't blend in very nicely,
but your background is REALLY nicely done,
so if the blending would be a little more subtle it would look really awesome!
maybe try using gradient maps(though i'm not really a fan of those)
or lower sasuke's opacity/fill
maybe adjust his color a bit with hue/saturation, so he goes better with the ''orange'' feeling i get from the background!
layer blending is always a great help,
but if that doesn't work out,
maybe try using a gaussian blur on, lets say, 10 pixels outline of sasuke
think that would make it awesome!
conclusion:
its an okay wallpaper as it is, but has a lot of potential of becoming something so much more!