This is very nice. I love the composition. I really like the gradations of light and shadow. It does a pretty good job of capturing texture. There are some who will not appreciate the grain inthe background. I happen to like it and believe it gives it character and captures a texture all its own. It looks to me like you may have dust on your sensor leading to quite a few artifacts which distract from this otherwise very worthy photo.
fits the challenge thru the show of the texture on the round object, but black specs on it is distracting. the glare on the bottom-right corner should have been cropped off.