svn is a version management-system like cvs, it contains the current source-code of blender. you can download this sourcecode and compile (‘build’) an executable program out of it.
but as a matter of fact this was unnessecary information concerning this image
I’ve been realizing more and more lately that it all comes down to lighting. Try changing your setup. I picture this image with a nice diffused glow from outside casting soft shadows. (As opposed to the general all-around illumination you have right now.) I would suggest area lights as a start…