I won't nitpick every detail since this looks nice enough already, but the trees would be formless blobs if it weren't for the use of highlights, I would probably work on them more. The brown house towards the back also isn't refined like the other houses, having jarring outlines that go against the low contrast outlines the other houses have.
Looking at the other houses now, I notice the roof pattern goes at an odd angle. A pain to tile, I know.