I know what you were going for, but the composition gives no feeling of height or depth. It's very flat. If it weren't for the title I'd think he was standing directly on the ground.
Those feet are positioned at the point horizontally where they aren't quite centered, but they're so close it almost feels like they were supposed to be centered. It's just a bit of an awkward spot to put your subject in, and without a specific reason for framing it that way, you'd probably be better off making it symetrical or more to one side.
I like the shot on the whole though. Very simple yet engaging and visually interesting.
for me a pair of shoes on a high ledge misses the focus of the ground breaking challenge.
"Now is your chance to show a photographic technique that you consider to be innovative"
In my opinion, this would be even more effective if:
- You shuffle a little to the left, so the right foot covers the crack in the wall.
- Crop out everything but the gravel
- A thin tall aspect ratio might give a toppling feeling
And if you have the time, it might be interesting to rake the gravel to produce horizontal or vertical lines etc. Then again, it might not - hard to tell unless you try! You could probably have a play in photoshop to get the effect before you go to the bother.
Also, you could try a few different pairs of shoes.