Hello, and greetings from the Critique Club. Allow me rip your photo to shreds in the name of constructive criticism (j/k!)
Initial Thoughts
Wooo.. that's a heck of a thing, cool angle.
Composition / Content
Very interesting and unique perspective, I like to see people trying new things, and this is pretty effectively done. Personally, I would have tried to avoid cropping the toe out on the side there.
Background
The upper sky is really nice, but might have benefitted from a polarizer or ND Grad filter. The bottom right is a little blown out, which detracts just a little bit.
Camera Work / Technical
Seems to me to be a *slight* over-exposure in areas here, though whether that was in-camera, or done in post-processing, I don't know. Your focus and DOF are great, but I'm thinking 1/500 would have given you a better exposure than 1/300. There are some hot-spots on the shoe itself that could have been better dealt with with a stop or a half-stop drop.
Digital Processing
Not sure what you did, but everything looks pretty good besides the exposure and hot-spot issues. Nice coloration on the shoe and the sky is ok (slightly darker would have been my own preference). Sharpness is wonderful.
Fits the Challenge
Definitely does that :)
My Opinion of the Photo
It's a fantastic original perspective, something different for a rather mundane challenge. The hot spots and exposure just kick this a little too far into the "Very good, but not *great*" range for me.
I think it's a great perspective and good idea!
The yellow/orange color of the sole does however distracts from the image IMHO. It looks like the white balance is off (the shoe might be that color but it's not a very appealing color to me at least... it might just be from a lot of clay tennis courts? :)
Nice depth of field by the way!
Good DOF capturing the logo, strong composition and good movement or action in the diagonal line. And the complementary colours add the finishing touch, excellent. I'd buy a pair, yo should get in touch with their advertising dept and show them this. 10