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From t.degroot@inter.nl.net:
As you say, the absence of the observer is not immediately obvious, but looking at the window, one feels slightly unconfortable (without knowing why, at first) then realizing that there is no reflection of one's self...
There is something strange with the lights. The lamp on the desk doesn't cast shadows, it seems, everywhere. I think you should play with the fade distance and power you obviously used. They are set too tight, I believe. Continue working also on your textures. The start is there, but you can certainly improve them!!! This is a good learning scene for different things.