Scrolling galleries are generally disliked by people because they can take a long time to load and distract from the listing they have chosen to view - especially when it is at the top. 

I think your listings look good, all the right info is there - clear and nicely presented, about the only thing I would really recommend is having the main description in slightly larger font to make the key info stand out just a little bit more. Most people would find your money-back guarantee more encoraging than a gallery of other items. 😉

In saying that, though, the only other suggestion would be to expand your range so that your items can cross-promote one another - other related sportswear or gear, or perhaps some MMA memorabilia. The more people who can find something they're looking for at your store, the better.