Looking really good Chris......really good.
Only 2 things stand out at the moment.....the corners between the ceiling and the walls looks, well, harsh. Difficult to describe but the two don't seem to be joined just because of the way it has rendered.
If the 'sun' you are using spills onto the upper surface of the ceiling, and the ceiling is just a plane then this can cause this effect. Strong light can and will 'bleed' through the corners....it's to do with the light illuminating the non-normal side of a poly. Easily solved though by adding some arbitary geometry to cover the outside, just another plane with the normals facing upward would do, just to deflect the spilled light.
This effect can also be caused by seperate objects, ie, the walls are one object and the ceiling another. Not knowing how you've created this I'm just trying to cover all the bases....LOL.
Apart from that and the fact the clocks wrong, (this is really nit-picking but check the hour hand position if the minute hand is nearly at half-past
), the rest looks great, and as you say, it's not even finished yet!
Regards.