Per user's suggestion. Edit away. Click the little black button next to the layers to make them disappear, then click them again to make them reappear.
I figured if I let you do the leg underneath my tutorial, you could compare the two when you're finished.
...This is not supposed to be a lesson in tracing. Don't do that, you learn nothing.
Ref used: http://www.cosmosmith.com/images/canisdirus1a.jpg