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First of all, welcome to the Sports Corner. I think you will find it is an incredible valuable resource for those us who shoot pucks, balls, bats, sticks and associated gear. Amazing photographers here who are always willing to lend a hand.
As for the photos, think Ben was right on the money about color and exposure. Looks like you have a handle on that. The place where I believe you can make these better is in the area of positioning, composition, timing and cropping.
Photo #1. Really close to being a nice stock photo of the Goalie. But if you were up a step higher -- or down a step lower, you could eliminate the bar of his cage covering his eyes. Little things like that make a big difference. Straighten the horizons. Work off the verticals of the goal post and you are on your way to a real winner.
Photo #2. Again square it up on teh verticals of the goal post. But more than that, the bigger issue here is the lack of defining action. As someone who wasn't at the game, I have no idea what is going on here. Other than an attacker hitting the goalie, I see nothing. Seems to me the play is clearly going on elsewhere.
Photo #3. See comments on number #2. I THINK I know what happened here (defenders took out the forward for hitting the keeper) but I am only guessing. Too many backs to me to get the real emotion of the play.
Photo #4 Nice timing on the missed glove save. Straighten it up and it's a keeper.
Photo #5 Without question, your best shot. Love the clear cage and the display of emotion that is clearly visible on his face. Great eyes -- even though partially closed -- because they match up with the open mouth in celebration. The only thing I would change is go vertical on the crop. Elimintates the floating hand on the left portion of the frame and locks the viewer's focus entirely on your subject.
Hope that helps. Keep in mind that with all C&C, the opinions expressed here are those of just one many. Others will look at it differently -- and that's why this is such a great resource. Again welcome, and keep them coming. There are some great hockey shooters here who will be happy to lend their knowledge.