Skeleton Concept Drawings

This was my first one of the three and it gave me a feel for how to draw a skeleton.  I feel to make it better, I could have made the ribs a little bigger and the spine thinner.

This was my second drawing and I think my favorite out of the three.  This one was also by fare the most proportionally correct out of the group.

This was my third and final concept drawing of a skeleton and I think it is the one with the most movement.  I also think to improve it I could have made the skull larger and give it more depth.