yup thank you for replying Yes i turned anti-alising in the render globals probably there is an option to improve antialiasing and i don't know it ?? about the ceiling, ok i will lower it more lol and any suggestion to make it look better? or did you mean the ceiling lamp? and yes i am using two ambien lights they are not too intense, probably they are too close? i don't know exactly how to place them one is outside the "room" close to the window the other one is in the center of the room, just below the ceiling lamp, could that be the problem for the edges?? thank you for helping