Well, that doesn't bode well with stock photography from what I am understand.
There isn't any subject as far as I can tell, almost looks like an accident shot. An abstract of the wood might've looked better from another angle other than "standing and point the camera down"... An extremely high or low angle can give these 'uninteresting' shots some interest.
Alternatively, get up close to a certain part, and MACRO it, with a nice short DOF, focusing in on something that catches your eye, although in that pile, nothing really does.
The photo is properly exposed, and the sunlight from the left is the only interesting part!
Hey, they only rejected one, that's good. Where do you sell stock photos at?