Comment on the scene to make a better lighting. And also does anyone have a camera tutorial for perspective here is a bit distorted. 
I think you will have to show your GI render parameters, and your lights before we can tell you how to make it better.
here you have the settings and the scene setup.
Thx
okay.
well, first of all use a higher darkmult. (or are the walls intended to be white later on?) and uncheck “affect background”. decrease your vray-light-mult and increase gi-mult. and sec.mult. then put a direct light into your scene to simulate a sun (check area-shadows and increase the sizes). i also would guess you should give your environment either a white color or a background. so you avert the greenstitch.
cool thx. My scene will be white inside. Except for the floor.