They look good overall.
1. Lighting sucks, but nice shot.
2. Need a touch more room on the right and less room on the left.
3. Nice shot. You may want to take a little space off of the left.
4. Great shot, but crop tighter on the left and right. Empty space is usually bad space in sports, unless it's for effects, imo.
5. Good action, but you really need the face in this one.
6. The next frame may be a bit better if you caught it, but solid shot here.
7. It's a cool shot for sure, but without the ball, it isn't the perfect shot.
From what it looks like, you need to try and get down lower on the field, if possible. Not being able to see faces/ball is the biggest thing that you can have in any sport. These comments are not by a professional nor are they meant to bring you down at all. You asked for some critiques and these are mine. Overall, I'd give you a solid B+. Now get back out there and shoot!