Hi Misa ^^
Ok the vectoring sure is nice. I just find the BG odd. I think it's too red that it kinda blended yuuki's hair
into the BG.
Here are some tips, I just hope it can be of some help.
These are the things I usually ask myself before walling.
1. Why do I want to wall this character/series?
2. What do I want it to look like in the end?
3. Having a scan at hand, what BG suits it? ( I usually get stuck in here) hehe
Seeing your scan and your wallpaper, I think you're aiming for a patterned wallpaper, and I think there's
nothing wrong with that. It's actually better than slapping the BG into some scenic stock photo (that is if
you're not good at blending, don't worry I suck at it xD). So now, I think the problem I see here is that the
colors as well as the too realistic BG. Need to work on that ^^. I can't give you my full tips ( like what I want
to do with it, if I were wall it) because this is your wallpaper so it's your decision. These are just my opinions.
^^