xpdev, I'd say your lighting is probably physically accurate. But you don't want that, so you need to think more in terms of lighting the interior the way you would for a photo shoot or as if it were a film set.

How you do that is part of the creative endeavour: you could try putting a big reflector in the room to bounce 'sunlight' back into the scene; or add some spotlights; or 'overexpose' by cranking the sunlight up to something crazy like 400% (which will burn out highlights outside the room - physically accurate).

Don't forget, photo-realism and physical accuracy are not the same thing. So you could experiment with GC values: see what happens if you raise GC to 5.0!

EDIT: cross-posted with Snarly: we're saying essentially the same thing and since I also used be a pro photographer you should assume that we know what we're talking about.

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