I like the shot. Good use of diagonals for action. I would consider either lightening up the arm a little, or decreasing the brightness of the background behind the arm. It just looks a little blown out...
i thought i seen something similar to this http://www.thephotoforum.com/forum/showthread.php?t=110423
It's an interesting idea, and I like the use of diagonals. But...I think this shot comes up short, and doesn't have any sort of 'wow' factor or 'pow'. The shot isn't glaring with weaknesses, but it's not staring me down with strengths either. Still though, interesting idea.
I like it a lot. Creative idea and good composition. Is it the way you angled the photo, or did you take this from bottom facing upwards? Serg