This image is well done. I agree with Mr. Anerino, I like how the main subject is a bit sharper/more focused than the rest of the kids. I did notice elements of composition in your image, such as simplicity. However, I think a soccer game is very difficult to try and get some elements of composition in your image due to all the motion, but I think you did the best you could. I think that the lighting in your image is not bad, but I think that if you did some dodging and burning to the image it would make it much more interesting. With the dodging and burning tool, you could darken the rest of the team and lighten #2 to make him stand out much more. My suggestions for next time would be to try and take the picture at a different angle. I think if you did this you would get more exciting perspectives of your image.
I really like the composition here the subject is in the middle third. This brings your eye to the center. The lighting could be a little brighter but overall its a great image. I don't think I have ever seen this done before like this so Its original and I love it. If i had to give you any suggestions i would say to maybe dodge and burn this a little like make the subject a little lighter and then the other things darker so it really draws your eye to the subject and maybe increase the contrast in curves a little. But overall I love this image