Attached Link: Interior Room Lit by Spot and a few (8) Omni Lights

All of the above if taken into consideration will be a good help. my input 1. Turn off the sun. 2. Put some walls in the "unseen" part of the room to simulate realism 3. Put spotlight to simulate sun coming in the window 4. Put some negative Omni lights (light with a minus multiplier) 5. DON'T USE VOLUMETRICS! slows your render time too much. 6. DO use PS7 or any paint program for postwork. hope this is enough.. tnx for the time in reading See inserted image if it helps