Cool picture, but I don't think it meets the challenge. There's nobody hidden in it, is there?
You should also have submitted a larger image if your camera allow you to. Always chose the largest width or height possible, which is 640 pixel. 4. (Which is a lot for a small picture that doesn't meet the challenge.)
I think this could have been a great entry for this challenge. Those roots are vaguely human in form and if you had a model painted white posing amid the roots, say for example near the top left portion of the photo, in semblance with the roots, this would work better in meeting the challenge. Or perhaps there really is a person here hidden somewhere, but I can't see her/him.
Suggestions: Keep entries at least 600 pixels on the long edge to preserve as much detail. This was a great idea that was hampered by technical issues.