First of all, I can see that you've used ArtificialRaindrop's wall:
Lost Carol by ArtificialRaindrop to make the
Shana one; you're not allowed to use other people's wallpapers to make your own.
The Hitagi wall has poor extraction; the edges are jagged, and I see you've blurred it a bit to try to hide it, but
that just makes the scan quality get worse. The composition of the wall could use some work; you've put another
image of Hitagi in the background at low opacity, we consider this "ghosting", which is often not allowed,
because it's tacky and too easy to do to fill up space. The text looks unnecessary, but if you really want text,
I'd put it on the left, in the middle of the background instead of on top of her.