i´m missing the bumpmap at the floor. and put a vray-compositing-tag on the abstract and unklick the "generate gi"-option. When the object generate gi, the rays will go many many times across the room. you know what i mean? the calculate-phase will be very shorten too. when the thing reflect the light (Global Illumination), then it create a lot of errors in lighting the room. and i would select the pink parts again and put it a bit out or in.
and let the sun (a invinite light with shadows in the vray sun option vray physical sky and sun activated) shine through the window.
and a other tip. if you ever have the problem, that you can´t see at the rendering look outside the window because it´s just white and overlightet, CHANGE THE COLORMAPPING IN VRAYSETTINGS TO HSV EXPONENTIAL! when you wan´t to get the blended white, like at this picture, set it to EXPONENTIAL without HSV. i just you these both colormappings and play sometimes with the bright-multiplier. for rendersettings of vray (the presets) i mostly use the "good and fast" or "small and print size" and just push the ambient occlusion in the setting of the gi a lil bit up. not the radius. just the amount.