this is pretty good. with a little more tweaking, you could get it close to photographic, but the set up you have looks pretty nice. thankfully you added a house in there and the sky looks great. I notice there is a haze show through under the trees, like the trees end there. you might want to very that edge by adding more trees in some places or push the forest even further into the distance to eliminate it.
that's the problem, either a part of the lake should be included to explain that effect or otherwise altered. It's one of the things that distracts the eye and lets the mind know this isn't real scenery.