like the idea of concentrating on a single subject and re-taking it until you're satisfied with the outcome.
I played around with the image in Picasa (that's all I have) and apart from cropping out the window, and bringing the front in a little the basic comp looks sound. What I did find, and don't know whether you will agree, is that when you zoom in, the number on the door looks a little soft? I think the focal point is the right hand side of the leaves on the tree to the left of the door...or maybe it's my eyesight!
hope that helps