Great job for your first wallpaper ^_^ I really like the idea you have here. There is a lot empty space though. It would've been nice if the image of the girl was bigger. But overall, I think this looks pretty good.
The background looks great. I really like the frame with the image of the dude in it. I makes this wallpaper a lighter, happy feel to it. The wallpaper looks good, but I have to say it's a bit overdone. The bottom part with the floral pattern would be nice just plain - one colour. The two patterns you mixed makes it look a bit overdone. The flower patterns would be nice if it was much smaller and in one row across the wallpaper.
Be proud. This is a good first wall :)