Upload & Sell: On
1 & 3 make good "stock" shots and easily sold to parents, etc., but for a story-telling perspective (if that's what you are trying to achieve) I would pass on them.
#8- I see what you're trying to do here, but no ball and no faces equals no keeper. The idea is good using the sign in the background to add a layer, so try it again.
#9- I like the expression on his face as well as the muddy jersey. This would be much better without the cheerleaders in the background.
#10- Dig the low and tight though you could crop this a little tighter to really make it even better. Love it. Very gritty feel.
#11- Tight and clean. This would be better if the kid stiff-arming was in mid-stride. Still a good shot.
#12- Same as 1&3. Pass.
#13- Very cool feature. Tight with a clean background and nice light. Good job.
#17- The noise and a lack of detail in the player's face hurts this. Also, the cheerleaders are looking at you which kills the candid feel you want and need here.
#18- Cool shot with the ball at the right moment though the ball is a little blurred which brings me to this: You can't shoot football (especially in daylight) at 1/500. You have a camera with the best high-ISO sensor on the planet, so use it.
#19 & #20 - Did you shoot these vertically or crop as such? Always (well, not always but the vast majority of the time) shoot horizontally and leave the cropping for later.
All in all, a good variety of shots and angles. It looked like you went in the stands for the last three which always helps to mix things up and see things from a different perspective.