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I'm guessing you weren't credentialed and shooting from the sidelines? No offense, from a sports action standpoint these just aren't working for me. Here's why:
#1 - Nothing going on at all; looks like random warm up by the kickers and snappers. I was a long snapper, so I like those guys but they don't make for many compelling images, especially not when they're not even doing anything!
#2 - QB isn't in focus and the action with the lineman isn't very compelling.
#3 - No face, no ball, action going away.
#4 - Timing is okay on this one, but the action is out of focus and there's just too much "stuff" in the foreground.
#5 - Your best shot!! Looks like you had the right angle with this one. Even the red stuff in the foreground isn't a deal breaker.
I don't mean to beat you up, but if you were shooting from the stands you're sort of behind the eight ball to begin with. And if you're shooting from down low that makes it even more difficult. I shoot from the stands now and then, but it's from a much higher angle that helps eliminate the distractions like you have in #4.
Keep shooting and keep posting.