Your website looks really good to me. It has a really nice and simple design. And the beat player is near the top of the page, which I love. If I was looking to buy beats, your site has a good simple design which would be easy to follow.
As far as the beats go, I’m don’t claim to be an expert, but I can tell you some things that have helped me! I think your beats are really good, and have a lot of good music elements. If you could work on one thing, I would probably say it is the mixing aspect. If I were you I would definately be sure that you are making room for the customers vocals. So maybe work on using eq, filters, and panning to create a space in the middle of the mix for their vocals to sit nicely.