Leg Review and Helpful Hints

A very quick review on how I do legs. I hope this helps anyone who is interested.

Points of Interest.
Gestures-Real quick scribbles that put thoughts on to paper. It's okay to be messy.
Armatures-Only the insides. Think of the bones while drawing this stage.
Tubes-kinda of like a robot. One of my art instructors swore by this technique and I do agree with him to a point. Mimics muscle mass. I prefer to use a series of curves to flesh out the mass though.

Only use dead straight lines when drawing parts of the body that lay close to the bone like part of the leg called the calves in profile. The thigh bone is encased in muscle.

Edit: Since this is another popular one, thanks to everyone who faved.