The message To me, this image nicely shows both the similarities and differences between these two items that obviously go together. The common color and functionality tie them together, while the separation between them emphasizes the differing textures and very different shapes. Overall a fairly interesting image, although not really compelling.
Creative choices The lighting here is so-so; it shows the textures OK but there is too much glare and the shadows aren't very interesting. Using a smaller key light positioned a bit lower and reducing the fill or ambient light would have created shadows that were sharper, longer, and darker, thus more exciting. The composition works well; the diagonal orientation of the bolt makes it dynamic, and having it point toward the nut helps tie the elements together. The elements are positioned well in the frame. The DOF is pretty shallow--the front of the nut and back of the bolt are blurry--and I'm not sure what this adds; I'd rather see everything in focus.
Technical aspects The exposure is great. So is the focus, although it is somewhat soft; sharpening would show off the textures better. There is a nice tonal range, and the color is nicely subtle. The noise in the shadows is mildly distracting.
Composition is very interesting with the diagonal alignment of the bolt pointing at the nut. Great closeup. You can see all the texture of the metal and all the imperfections on it. The grooves of the bolt is interesting.
Nice, seems a little bit out of focus, playing with it in PS it looks a little clearer. Nice lighting, maybe a bit more on the left hand side? Good shot! 8
Lighting on the subject seems to be perfect but on the background surface is a different story. Seems washed out on the right side. I would have preferred a smoother gradation and a smaller hotspot. Perfect focus and amazing details, though.