Here is Usagi in normal garb and no deformities, and here he is practically naked. I swear this was part of the assignment! I chose this type of underwear to give Usagi a bit of current fashion.
Above is a study of the skeletal system and then the muscles. I figured Usagi would have a six-pack, since he's such a great swordsman. I'm not sure if that is what bunny ear muscles look like or not, but it was fun to draw.