I'm with sl1982. Great job Mayo Master! I just think it would benefit from softer shadows, as if the light was a bit more diffuse.
Well, there can be some sort of open debate about this. On the one hand, as you mention, softer shadows may give a more realistic feeling to that scene, because indoor lighting/shadowing tends to do that. On the other hand, the original picture has somewhat hard shadows.
Since the general guideline was to remain faithful to the original looks, so far I chose to have only very slightly softened shadows. I could play around with soft shadows settings and submit that to a vote.
EDIT: So here are 4 tests with different settings for softshadows. The top-left picture is the version previsouly submitted (with soft shadows setting to 6), the others are with stronger shoft shadow settings (48, 86, 192). Click for a higher resolutions, the scenes were rendered here at 50% of the size.
While the strongest soft shadow settings feels more realistic, some shadows are so softened that they completely disappear. I think namely of the shadow of the rectangular pipe that is casted on the rotating beacon, in the top corner of the room. With that in mind, I would rather choose soft shadow settings between 48 and 96, but I'm open to suggestions.
One other thing I am considering, though it is separate from the lighting/shadowing: I'm considering using a displacement to model the cracks in the wooden floor (bumpmaps are used so far) to have even more realistic shadows. I think it would improve the area around the doormat. However, I will have to subsurf the floor so much that I don't know if my computer can take it.