I think this is my first time posting in this thread. If you've caught any of the threads I've started lately, you know I've been working on how to defeat the sun when shooting horse portraiture. The dogs, for better or worse, get to be my experiment for smaller scale practice sessions and when the horses don't want to cooperate. This is with a circular polarizer and a 550EX tethered to the 5DII using a TTL cord. Shot with the 17-40L @ 17mm, ISO100, 1/180sec, f/5.6. I don't really compose when I shoot like this; I just hold the camera down to the ground and point it up at the subject. I try to focus more attention on where I'm pointing the speedlight.
IMG_1538-Edit by Ranger_Bob, on Flickr