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Rembrandt shows how it's done
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The point, for starters, is to physically loosen your arm, like a dancer or an athlete stretch
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ing and warming up, and get the hand-eye thing working beautifully - and to turn off the whole naming, worrying, trying-to-do-it-right side of the mind.
What's fantastically liberating is that you don't care what the drawing looks like. Its chaotic, scribbly appearance is beside the point - you are practicing the action of drawing.
So: scribble, madly, with the whole arm and stop thinking. Try to quiet down your internal monologue to complete silence, and if you can't (it's the task of a lifetime), overwhelm it with an internal joyful scream.
No outlines, no eyelashes and earlobes - big swooping gestures that capture the inner energy, the line of action, the brave battle
against gravity, the effort of being. As fast as you can.
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Like this.
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Not like this (this is by Ingres)