Well, unless there's a secondary light source, I think he'd be a whole lot darker than that, considering the sun is DIRECTLY behind him.. Just like the mountains.
Also, the grass should be darker, from our view, as well, because we're not seeing the lit up side.
Anyways, those will be problems unless you want a completely dark piece. It's good as it is, but those points you may want to consider if you want to be fully realistic.