No sorcery, it's just a technique used to keep your initial framework for the drawing (read: Guidelines) loose and fluid.
Originally Posted by Snakefire15
BTW, if you're going for a solid black area, keep your pencil strokes the same - We can see everywhere you changed the strokes. Keeping it all one direction is just better aesthetics. (or maybe just my opinion - I don't like to state things as ultimate truths)
Doctors heal you, Artists immortalize you.
"Those who can, do. Those who can't, teach" - bullshit.
The usual staples for anatomy: