I'm quite new to Vray, so I won't say much here - I know there are better places to look for Vray info :) I put five rectangular Vray area lights over the desk and one big square filling light. For indirect illumination I used Irradiance map and Light cache, with saturation lowered to 0.7 because of too much color bleeding. Color mapping was set to exponential. After final rendering I realized the scene looked a bit flat, so I decided to make an Ambient Occlusion pass. In Vray rc2 it's pretty easy. You need to use Vray Light Material and Vray Dirt. Remember to turn off lights and GI and set Color mapping to normal. Here is my material setup. For postproduction purposes I rendered a z-depth pass, for which I had to use scanline renderer. In Vray it looked jaggy and aliased.
The postproduction was really simple. I opened all the passes in Photoshop, then used the depth pass for Depth Map in Lens Blur filter. The Ambient Occlusion pass was also blurred with Lens Blur and put on 60% Multiply