I think your wallpaper is beautiful, but you must practice hard to make more beautiful wallpaper (don't worry, I same as you. I still study hard to make beautiful wallpaper....)
And I think, that will be better if the BG (Amu and friends) is separated and submitted in other wallpaper. The (Big) Amu in the left better if submitted as one wallpaper. So, it can be two ifferent wallpaper. It will be better, I think.