Work on a better Background. That bg doesn't fit with the wall here at all. You should also work on your text/font,andtext placement.Keep making them though, it's not bad for a first.
The cropping, the BG, and the text all need some work.The cropping just needs some touching up around the helmet, and down his shoulders to his arms. Nothing too big, but worth fixing up. You're getting better at cropping though, keep it up.The BG is plain, boring, and really doesn't have anything to do with NFL at all. Get, and play around with some better brushes at Deviant Art.The text is plain, and doesn't really look good where it's placed. Work on the placement, and give it some good effects [Right click the layer >>> Blending options]Keep working, you will get better as you get more expierenced.
