Hello.
1st You must use many lights in the scene (not 1 like this scene) , May be lamps IES… with beautiful effects and DOME LIGHTS with HDRI map for realistic environment. If you have a window - put in this scene some rays from SUN, and (!) put in windows PORTAL LIGHTS with vector to inside.
2nd In Settings - find max noise - and pull some down - give better result but long render
3nd If you want use RT Engine - (i see you have VRAY2) be carefull with to much enaugh rays settings (collin suggestions)
use tutorials like
