There is a bit of work to be done on the tessellation part of it (you can see the polygons quite clearly on the chair legs), and the textures could use a little love here and there. This is usually a case of taking the time to address each part of the scene. To be more efficient, I usually hide everything but the part I'm adjusting, then unhide it to see how it fits in the general picture.
That said, I do think you've managed to make a pretty damn nice mood here! I love the subtle gradient light-to-dark atmosphere.