hi guys.congroo.
it is good work but if u just use of hdr,it was better and had good result.
but I say some tip to will make it reaslystic.
u can use of hdr with sun to have good shadows.
some of place in ur render is overberightnes that should control exposure and light.
some of ur materal is not good at all like that stone in your center of image as a desk.
and I think that photo u used at back,is rescale..
good luck...
