Hi, well my opinion is if you have vectored yourself the character you have done a good job. But the problem here is the
background. Infact it could be too "easy" and "simple" to be accepted on minitokyo. I could say it
because my Kobato wallpaper was moved on Indy art for the same reason (and my background was more elaborated respect
yours).
Second problem is that the composition is unbalanced, with the character to the left and nothing to the right or at the
centre/middle of the wallpaper. But this is a good start in my opinion and my advice is to not change it but simply
think what you can add to the right and create something more complicated. Or if you have vectored the character (it
means you know how vectoring) you could search a scenic scan (a room, a place open-air) and vectored it to blend the
character with the background. These are two option but you can think anything else, of course.
Hope my advices could help you.
Bye, SamB.