Iria! Kick ass!
Hmm... nice idea for a first wall, but a bunch of items to look at. Allow me to constructively criticize/suggest
things!
Iria literally looks like she's standing on the edge of the paper. Floating there, like she's not a PART of
it. Make her a part of the background, build a real picture.
For instance, the tree looks like it's panned up. I mean, it's the top of it, you don't see the bottom.
So Iria is out of the picture, and apparently floating in the sky! >_< Put them on the level, and remember,
scaling! You can have a smaller tree, just put it behind her. Show some ground for a point of reference.
Or have the tree bigger, and Iria in the background. Some sort of depth will help!
The colors... I like how the red looks. Like there's a fire over the horizon or something. But... I don't think that's what you had in mind. Maybe? The red, with the blue and purple, just seems to be mixed together for the fun of it.
Colors as a BG is fine, but it looks like you tried creating a scene, for which it doesn't fit.
Some things to keep in mind for next time! Cause you can always try more and keep improving! =^_^=