Too flat composition to me, no contrast or different zones, may be a different view with other backgrond or shooting not from the fornt but from another "strange" angle could had mede it more "impresive".
I like the softness of this image, contrasts nicely with the hardness of the subject.
Highlights seem to be a bit washed out, but overall image is good.
This is an excellent subject for this challenge. The photo is a good bit over exposed tho... I"m assuming these were dark colored, as most are. When you are pointing your camera at a predominantly dark colored scene, the reflected light coming back to your camera is less than it should be for a proper metering. I think that underexposing this shot by 1 stop (-1 EV) would probably bring it back to par. You may also be able to adjust some of this out with level adjustments also...