advanced rendering for AutoCAD
I think reflections on the walls are OK. the left windows is apparently smaller than the right one, so its reflection looks right to me. If you leave NXT to make more passes i think it will clear the situation, especially as regards the very bright strip of light going from the left window towards the bathtub. I would tried path rather than packet tracer here. The model is great so the finishing rendering should be too :)
It's the angle of the sun coming through the windows. The sun is slightly to the right so it shines on the left wall.
The sun coming through the right hand windows is shining on the side of the bath.
If you don't want this, turn cloudiness up to 1.0 or move the sun round 180 degrees.
What I do not get is the fact the bright ray on the left stops abruptly, I would have expect it to go all the way down over the bath tub to and not stop just before the faucet.
Here is the model with the materials so I can stay within the 5MB limit.