With the varied colors and all that's going on this shot, it's a bit busy for me. I do like the angle and the focus. I think maybe if you put it in black and white, then the color would no longer distract and you could concentrate on all of the other interesting elements of this shot. I think I'd crop out the chrome upon which the shoe is resting. I don't think you need it to ground the foot. 7
The composition has good potential, but would make a little more sense if the camera was a little higher. It kind of gives the impression of the viewer having just been run over by the biker in the shot as it is now. Seeing the sole of someones shoe gives the psychological image of being trampled underfoot, you get me? And maybe the depth of field could have pulled the viewers focus down to the boot rather than the petrol tank in the centre. Look at the writing on the boot and tank to see what I mean. And a tiny point lastly, but would a battered 10 year old scruffy pair of boots fitted the title a bit more?
I like your creative idea for this challenge. It's the first I've seen. I like the chrome. I also really like your choice of boarder colors! Great job.