That's a really good first attempt. The human body is the most difficult thing to model. I have a tip to offer. If you have poser, or if you can get a realistic human into your program, then use it as a base to start from. Freeze (disable editing of) the hipoly model, then build your low poly model over it.
Another tip, start with a lower polygon model, then increase the poly count on your next model. Try making a 300 - 500 poly model. It will look blocky, but it will teach you the basics. It's easier to learn from your mistakes on a low poly model. When you work on higher poly models, you will know what not to do, and it will be less frustrating.