I believe that I like the middle image the best. It has a wonderful sense of place, interesting movement in the wheel, and good tonal values. We can see the texture of the metal nicely as well, which helps give this image a nostalgic feel. My eye is bounded, softly, by the line of the wheel, but it moves easily down the length of the machinery to the far wheel and back again.
The others are nice too - the bottom image being strongest. I particularly like the level of detail in the hub that you present in that one. These types of images always make me want to see more details. The heavy presence of the hub keeps my eye in the frame despite the radial lines of the spokes leading the the edges. The length of the body give this one great depth as well.
Nice work all around here. I'd like to see more of this subject and it's surroundings.
- Randy