That house is cool, but im not such a big fan of using that blue and green to cover the levels. Instead maybe patch out an outline of some dirt path and add some village walkway tiles, like this:
The second change I would do is the level detail. Well not change but improve. Its good what you have but you need more of it, BUT if you just smother the level it will look bad, as it will repeat.
SO maybe fill it in by adding some groups of trees together, as thats a great way to fill in space.
Last thing is the mountain at the bottom, just make it less straight. Great level though
