First of all, i really love how the girl goes well with the background. I can tell that she is enjoying the view of the city/ town. You did really well with the background since it looks lifelike and it gives you this city like feeling. And you really did well with the setting on how the houses and the buildings are all three dimensional if look though it in perspective. The only problem is that the background pays much impact and attention than the girl which is just the only slight problem. All in all everything is good~! Hope this critique helped you. It's ok if you disagree on some points.
The background is AMAZING! Its just so detailed and everything has perfect porportions. As for the girl she doesnt stand out of the picture, she fits right in(i mean that in a good way). Also the shading is absoulutly perfect! All in all the every bit of the peice really comliments each other(uhhhhh does that make sense?). I can only whish to be as good as you in paint tool sai, only because I just got is the other day, but just by looking at this I wonder how does somone make spmething so impressive? You must spend hours on your peices, and they are all beautiful and amazing, someday I whish to be as great of a digital artist as yourself.
Just to be honest, I'm always impressed with how detailed things like city buildings and other urban structures are when they're drawn anime style. It gives me a good feeling knowing that there's somebody who can do building better than me. (Seriously, I SUCK at drawing buildings, unless I use a ruler.)