Camera Work/Technical: Very nice focus and a terrific depth of field. The perfect point of your subject is nicely isolated from the background using great colors along with the great depth of field.
Lighting: Your subject is well lit, but the shadow/highlight contrast of the background is a bit distracting. Perhaps shifting your position a bit or waiting for a different time of day would have helped out.
Composition/Content: Your chosen composition is a great strength. The rusted iron provides a very nice leading line that pulls the eye right into the main focus of the image. The great depth of field keeps the eye on what is most important inside the frame.
My Opinion: Nice work meeting the challenge, as well as producing an image that is a good deal better than the 5.28 that it scored.
Nice tones in the metal and nice contrasts with the green background. The cob webs are a little distracting though as is the shadow line in the background.
TC