Interesting subject, wonder if it was to an actual vehicle of some sort or mabe a grinding wheel. Your arrangement is good it seems a little dull (of course there isn't a whole lot of color anyway) but still a good image. Good luck.
This is a nice image. I like the line seen in the wheel of this image. I wish you would have backed up a little bit though because the image almost looks a little bit out of focus as you work your way to the outside of the image but that may just be how the rock looks in general. Nice work though.