things to Work on:

1.Shading
2.i forgot the Link but somewhere on the forums there was a post on how to make Houses not seem Flat
3.if it's going to be on a game i would say not to make it so big o.o
4.whats with so much windows on a house is it gonna be longer then put all four windows but i would say to take out the first two windows.

that's all i can say cuz i suck at pixel art but working on it >.<

Thanks guys for your replies. I gotta say that it looks much better when it's shrinked by half. The quality increased and looks great in game. Thanks for your replies :D.