A big hello to all kind people in here! 
U know wot u guys rock! Thnx for ur kind comments. I knew while posting my work in here that my work is going to b appreciated/critisized in a very constructive manner. I m really thankful to all of u. 
Yes, i'm working on the illumination part n also this 'Bump' method. guess i still have to learn a lot. It'd b really appreciated if sumbody cud guide me to a detailed tutorial/thread for adding bumps n perfect illumination. i got really confused while positioning the sun. how do i set the position of sun if i want to let the sunrays come thru the window? n wudn't that b insuffcient if i want to lit the room with only sunlight n no artificial light inside the room? i've searched for these on my own but cud only find few posts here n there. 
BTW all the models in scene have been downloaded from 3d warehouse. Sorry if few r luking like 2ds. Guess that adding "bump' thing has to b involved here for a perfect look. will b working on it right away.
Thank guys! cheers! 