A very nice abstract composition. Greys are generally good and you have a full tonal range from black to white. Fine detail is grainy sharp without looking oversharpened.
The reflection off some of the metal parts are overexposed.
I am torn with this image - on one hand i think you may have gotten a like too USM filter happier, but on the other hand i love the effect of you getting USM filter happy. I really had to take a good think before realising what the image was of.
Interesting photo...I'm not sure about how it fits the challenge (I suppose darkness could mean your dark winter shirt, but is that really what darkness *means* to you?) Don't get me wrong, I love the photo, this looks like something I would take. It just seems to be a bit of a stretch with this particular challenge. :)
I wish I understood this. I suspect it is simply my ignorance that I don't recognize these objects at all. Nonetheless, I love the image. The contrast of textures is beautiful, and the lighting on the metallic objects are great as well. I'll check back when the challenge ends to see what they are. Great job!