I don't really dig those wall planks though, they look a bit out of place - like they were drawn on a flat surface. If you would go as far as modeling those, I think that it would easily be really close to reality.
I also love the light and general look, esp. when looked at from thumbnail distance.
But there is odd artifact that distracts from overall quality and it took me a moment to find. Tomislavn has described it, it's the planks. The reasoning is as follow:
If you had them modelled in 3D (or with displacement), they would trap heavy, black shadows like the rest of your image because of strong direct light and boosted contrast. But because they are flat, they only contain diffuse-like shadows which clash with the rest of the scene.
And lastly, the scene needs much more passes to clean out the noise. It would definitely push this higher :- )