First off, beautiful photo's.
Critique :
1. I'd like to see a bit more shadow detail in the first image near the base of the lens. Not a whole lot, it's near perfect, just a little. One more thing and I think it could be a full page ad for Canon.
2. Backlighting, just a tad on all three photo's a strobe with a snoot or some kind of lighting with homemade snoot. A subtle defining line around the edge of the lens will make all the difference in the world as far as separating it from the background.
Aloha, iamKalaniPrince