Really liking the depth to it. Has a nice cool feel to it although lighting could use some more work. @Noam you don't always have to add in flares etc. It crowds and most of the time takes away from the focal. Simplicity is key in some circumstances =P
Looks good, although if your going to keep it not transparent I would try and find a nice border to snazzy it up. Looks bland on the out side, but You done a good job with lighting and texture in C4D.