#2 is the best one. It does need to be cropped closer and it looks a bit overexposed, but you have something there. I've shot my kids soccer for three years and can vouch for how difficult kids soccer can be to shoot.
From my own experience, here are a few tips.
1) You need to see the kids' eyes or the shot is nearly worthless
2) Rule #1 can be overruled by extreme action/ball mid-air
3) Get low when you shoot - probably on your knees, but at least at the kids eye level.
4) move around during the shoot - behind each side of the goal and the far sidelines - this is usually not a problem in the lower soccer levels
5) use a monopod - people will think you're weird or pretentious, but the shots will be better