Thanks. I noticed the same thing when I was fixing the windows myself. Did all I could and well, it never really turned out the way I wanted it ^_^;

Yeah, the perspective in the foreground is off - the windows on the lighter side of the building don't follow the agnle of the roof. They should either be parallel or slightly straighter than the line of the roof - at the moment their horizontals are slightly more inclines, which makes them look kind of droopy. Out of curiosity, I tried moving the left-hand and middle columns of windows up one pixel, which helped a little, but the fact that the windows aren't all the same width complicates things.

I sympathise. Perspective's a bitch, especially in pixels.