Not a bad first attempt. Close in on the action. Got some good facial expressions and good colour saturation.
Being very picky a few just slice the tops of heads, and you are too high up. For senior Rugby the photos are better taken from a low aspect - sat on a small stool or kneeling down. With little people like this the effect is exaggarated as you are obviously stood up taking these. Get lower if you can!
Good first attempt though...