I liked the texture for the wals
I totally agree with Perfecto, and Arran's grave idea may look nice too.
Here's some other advice for you:
* I think you should put some clouds and a sun with the circles effect from it.
* The roof on the right looks pretty flat, try and fix it (break/tear small pieces of it / put a texture on it).
* Turn over a bench.
* Make a dirt road to where the doorway once was.
Hope this helps,
Benny