Ooo...I love the color scheme of this wall...nice choice of scan as well (wish the posted link was fullsize though)
The background still feels very flat/empty however and somewhat disconnected from the character...so I'm just going
to toss out some ideas worth trying...
Have you tried putting a texture or partial pattern on the background (to add more depth) ?
Although I really like the color, it might also be worth testing out a slightly darker shade of orange as well that
allows the character's shadowy edges to blend in more
Also see if there is a smaller light colored object that you could place on the left side of the wall to balance out all
the white of the character on the right (a feather, ribbon, etc)
A nice scripty text might also help bring things together
Hope some of these ideas help :)