After some work with pencil and my tablet, and the purchases of some books, I've done these sketches. It was about a 30 minute session while my friends were playing on their new Xbox 360. The top is a cougar, the bottom left is a digitigrade paw, and the bottom right is the left arm of a man, raised, from the front. The bottom two sketches show muscle patterns. There is more fine detail than I can show here, until I can get a scanner and re-upload this.