Nice use of a very simple brush! I love this scene. It reminds me of old anime shows, like Ninja Scroll and Princess Mononoke. My favorite part of this image is the tree leaves. The grass and bushes are pretty good, though, and the lighting of the scene is great. If you were to improve on anything, you may want to try a direct reflection on the water rather than a skewed one. Also, some of the tree trunks seem to just cut off rather than go behind the foliage.