I too thot it was very church-like until I saw the rest of the image.
CC time.
For a room with that much light, that many windows, The lighter furniture would be very highkey. This image (aside from the windows) is a mid-key image, which doesn't fit for a room with windows on 3 sides. So my photographer's spidey sense tells me this is a render. (which of course I know) but you know what I mean.
The other thing is that the floor has no variations. For wood floors (real ones, not printed Ikea tiles) Each strip of wood has a slightly different reflective and specular 'feel'. This may not be possible with maxwell the way it sits. I haven't explored the texture mapping part of Maxwell yet, but if you could put a custom made specular/reflection map to the floor it would add another notch of realism.
Try turning on the lights at the top of the scene. Nothing helps create realism and drama like the contrast between warm human, and cool outdoor lighting.
I've never actually seen a house, even one this fancy without some form of floor molding. Mostly due to the fact that it's damn near impossible to install wood flooring with a perfect edge against a wall... believe me, I've tried.
Try adding a large (warm color) light object behind the camera. This will add a bit of warmth to the interior and suggest space behind the viewer, plus add much needed definition and hilights to the fireplace, overhead track lighting and couches.
Remember, selling reality often entails faking reality. ;P
Otherwise it's a stunning image!
