That's a pretty nice vector you have there. Really good job for your first wall on that part. The colouring is nice, but I think the outlines look a bit too strong compared to it's soft colouring. It might also be the thickness. The text is placed nicely and actually looks pretty decent. Keep up the good work with that! The background and the ghosted girl..I somehow find the ghosted girl more fitting than the actual vector placed. This is most likely because she isn't blended into the background at all. If you did that nicely, then there wouldn't be a need for ghosting and the wallaper would end up being entirely scenic.
Nevertheless, I'm liking it.