I have originaly created this picture for our student comunity server as part of its logo for exam period (it was quite small, about 150*150 px). Later, I decided to make a high-res version and tried to push the level of realism as far as I could. This is the result.
I had quite a dilemma whether to use DOF or not. In this version, I am using V-Ray camera DOF
Permission is given to use the image under the terms of the CC-BY-SA licence