Fantastic detail. I like the spikes coming out of the shoulders and the techy bits around the top gem (the eye?). If you squint at the torso, it sort of looks like he has a second, human face in there (if the two central gems are eyes, and the sticky-up rock in the middle of the chest is a nose, then there's an upwards curving ridge which makes him look like he's grinning madly). Anyway, great work 
Thanks