One great resource for models for artist to draw is Live Model Books. They have models of different sizes, race, and gender; clothed and unclothed (PoseSpace). The majority of the models positions are shown in positions at 360 degrees in high resolution.
They recently added graphic drawing of figures in various poses (PoseMuse). This is a great resource to learn to draw figures and use them in your work. Below is an example of their new PoseMuse images. The Site does charge for the poses, but at a very reasonable prices.
Check out more of their images, real and graphic at Live Model Books