It needs to have a meaning behind it. Every good character-focused wallpaper has a meaning. Take this one by @Menace for example:
It's about a creature called the Leshen in the forest encountering a parrot, making friends with it.
Just a constructive criticism.
It looks bland, it has no lighting, and has flatlands. What's the story behind this wallpaper? Fix the lighting, use a schematic and make a scene with a meaning behind it.