Can we get a front view? It's easier to notice things wrong with it when we can look at a front view. However, from looking at him...

1-The part right below the pelvic bone looks a bit shabby.
2-The pelvic looks too flat, round it so that it flows between the legs a bit more.
3-Unless he is wearing tight jeans, the area above the pelvic shouldn't come in then out.
4- His body cavity is way too tall, and
5- His chest cavity is way too flat.
6- He has no palm, make the fingers further out from the wrist.

when the model is finished i will add a normalmap to add more detail to his chest.

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.

My tip: when tuning the proportions use the photo of a real human as a background texture, or something like that, this will definately make it easier