Update: As of June 6th, 2005; this model, the squig, and the grot standard bearer are all to be considered Stolen. Sadly, I had this model, and the entire army I was working on stolen out of my car in June. Sucks. But now I'm working on something new.
All the horn parts are shaded very nicely. I would not have used all these different base-colours on the boss (green/blue/red/yellow), the overall look gets a bit lost in all the details. But your painting technique looks good...