Me too (as you can probably tell from some pieces in my gallery :P )
Very cool. And yeah dithering on the black dome is understandable cos the real thing (and my NECA action figure of it) has a mesh like effect on that part so it's all 'dotty' anyways. :
i dunno i think in the movie the black has like white spots on it so i kinda tried to dither it in lightly
Not exactly sure what the dithering on the helmet(?) is supposed to be portraying, but overall nice work. 
yeah all your work is awesome