too dark for me personally, I would up your light intensity and global illumination bounces or indirect lighting some. I realize you have a movie on in this scene and so it probably makes sense for it to be a bit darker, but the scene as a whole reminds me of an architectural visualization and the thing that stands out to me about architectural visualizations is that they usually have really nice lighting. So I would really try and push the lighting more and try and get more gradients going along the walls and maybe even a small amount of bloom going as well.
Did you bake an ambient occlusion? That can provide more shape to your geometry, also I recommend not to use a solid color as you sky in the final composition. Try to match it with the light.
Echoing what robert.nally said, the walls definitely some separation from each other. The first impression I get is that it's a bunch of props floating in a space because the walls and ceiling all blend together so much.
A lot of the points of contrast in the reference are lost a little in your version, too. The bright TV, the window and the spot of light it casts on the floor, the lighting directly above and below the TV - without these your scene feels a little flat and loses some focus.
If you push the lighting some more it'll make a big impact on your scene and close a lot of the gap between your version/the concept.
I would suggest adding some skirting along the bottom of your walls, it will help with the transition between the wall and floor and it is very common in buildings.
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A lot of the points of contrast in the reference are lost a little in your version, too. The bright TV, the window and the spot of light it casts on the floor, the lighting directly above and below the TV - without these your scene feels a little flat and loses some focus.
If you push the lighting some more it'll make a big impact on your scene and close a lot of the gap between your version/the concept.
I raised the intensity of the lights and created more highlights along the wall.