Nice shot!!, I really would like add a macro lens to my collection keep going back and forth on whether to get the 100mm or the 60mm. The 60 would be a little more versatle but the extra zoom on the 100 makes for some cool shots.
By the way did you use any external lighting, and what settings did you use (iso, shutter speed, F-stop) just curious how much light you lose through the macro.