I was going to say that it was too much brown... but when I see it in a level, it isn't
:P
the top is a little too plain, but I don't know how you could fix that...
It would look awsome in a dark, densly wooded forest though
also, level-wise, the shadows for the trees are directly under... but the shadow for the house is as big as the house itself infront of it... (looks like the sun is setting or something, and not overhead, like suggested with the trees)
but I do understand that the level was just made to show the house
:P