Woah!

There's a huge amount of stuff in this scene, and it's all incredibly realistic.

But... it still doesn't look real. There's a few things that stand out to me as
being wrong, though I don't know if that's what creates the overall effect of
un-realism, but in any case I'll list the things I've noticed:

A lot of the materials look perfectly smooth - the walls, the ceiling tiles and
metal strips between them, the blue-grey colour on the desks. These are all
things which would usually have some measure of bumpiness and/or imperfection.
Google found a good photo of ceiling tiles:
http://www.sachem.k12.ny.us/building_construction/Chippewa%20pictures/P1200047.JPG

The highlight on the table in the foreground looks like a simple specular
highlight which seems out of place in such a realistic scene, and inconsistent
with the sharp reflections in the desk surface (i.e. shiny surfaces have small
highlights). Maybe, if you want photorealism, try some blurred reflections.

Some other material suggestions: The screwed up paper & post-its look wrong -
probably needs sub surface scattering, the chairs look a bit hard - maybe an
anisotropic fur material would help?, the beige plastic on the PCs isn't quite
shiny enough, and the wood on the desks and shelves doesn't look like anything
I've seen on such furniture but it looks pretty realistic.

The whole office is incredibly clean, no ash in the ashtray, no coffee marks in
the mug or rings on the table, no scuff marks on the floor, water stains round
the plant pot, dust, and all the desks seem perfectly aligned. None of that is
impossible, just very unlikely.

...and that's everything I can see that's wrong with it! Personally I think the
lighting looks really good. Plus the modelling details are stunning! I'm very
impressed by the overall sense of clutter, that's incredibly hard to do in a ray
traced scene and you've done it very well. How much thought did you put into the
chair positions? They seem very natural.

Hope that's of some use to you. It really is an awesome image.

-- 
Tek
www.evilsuperbrain.com

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