lol pixel buildings!! that owns, I've made a whole city once, lol. Maybe I should post that later. That took you 2 hrs eh? well , good job. On the windows on the side of the building, you could make it look more perspective, like adding the inside border on it, (if you see what I mean, don't really know what to say ^_^). Smart Idea to put it in a sig.

If I should comment the sig, I would say that the bg looks too flat, but maybe you wanted it to be that to bring out the building... Good job anyway, lol, since it's pixelart.