I like the composition, the DOF and the mood of this image, a lot. For some reason I wish the tree in the background was a little lighter but I'm not sure why.
I am not sure if the original is large enough to support an aggressive crop, but I would like to see a square crop of only the tree and a fragment of the foreground running along the lower edge of the darker vegetation under the tree. There may be a lot of resulting noise but it would be close to an impressionist/pointillist sort of treatment.