For all the people who want to improve their drawing and painting skills, here I put two very good websites where you can find great references for human figure drawing.
The first one I found it a very long time ago via facebook, it is called posemaniacs. In this site you can find plenty of computer generated human models without skin (so you can see the muscles) in a big variety of poses, perspectives, body types, etc. I has also a mode for drawing 30 second poses which is great to practice some quick gesture drawing.
The second one I just found it today although it seems it has been around for about ten years. This one has a lot of pictures of real models, humans, objects and textures. Really cool to get your reference material from, to help you in your process.