Love the image for the pose and mostly becasue of the BKGR. I was going that day for such a shot with fill flash in contra light and managed to take one :)
Here are the details:
1D Mark III, 400mm f/5.6L, 580EX II (set at -2/3) + Better Beamer.
Manual mode: f5.6 @ 1/400 sec, ISO 1000.
Enjoy ;)