I really like this photo.. I would add a little contrast, but thats all.. Love the hill, the tilt of the tree and well the relaxing feel this photo gives.. nice job!
Heehee, unlike Jeff I would crop some of the sky but leave the hill untouched, and some in from the left, and then I'd tweak the curves a bit to bring out the colours more.
Other than that composition is really good here. Well spotted subject!!!