Great use of DOF for this shot. Love the central theme of rust in this composition as well as the continuity you keep in the shot with most of the pieces extending out of the frame of view (notable exception in top right corner of the photo). I wish you hadn't captured the shadow in the lower left corner but overall this is a very strong photo.
The subject is mostly well lit and the the diffused background provides good contrast to expose the geometry. The shadow and what appears to be a burned out match in the lower left hand corner detract.
The point of view and composition are the larger distractions for me.
Composition: Subject Placement, Cropping, Background 5
Technical: Focus, Exposure, Lighting, Processing 7
Appeal: Is it Interesting, Motivating, Etc.? 3
How well does it meet the challenge: 10
Total Averaged Rating 6.25 Dick
Composition: Subject Placement, Cropping, Background 6
Technical: Focus, Exposure, Lighting, Processing 6
Appeal: Is it Interesting, Motivating, Etc. 5
How well does it meet the challenge: 7
Total Averaged Rating(Rounded) 6