Why should you learn to draw a skull?

There’s a simple secret to mastering how to draw anything in a realistic way—learn about its internal structure before you ever put pencil to paper. In doing this, you’ll be better informed about why something looks the way it does, and you’ll have a clearer idea of how your subject moves.
 This is perhaps best illustrated in the human head.
 By learning how to draw a skull, it makes the task of sketching the nose, lips, and eyes less confusing.
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