Tutorial - Curves on Girls by *Ai-Bee on deviantART. Reaaaal good tut on different body types. In her deviant there is also a lot of links to others tutorials for men and women body types. If you draw characters, go see this.
now this is really impressive, it's a gesture drawing in 30 seconds, and you can just see the professionalism in these lines. this person knows what they're doing and you can get to their level only with practice