This must be the same reasoning behind drawing anatomy - bones, muscles, etc. I never got off on that personally. I just reasoned that I should rely on what I see, not what I don't see. But your point is well taken, and I have no argument with people who go to all the trouble with anatomy. I would think this visualization process more applicable to illustrating rather than drawing from life. If you are illustrating an animated figure, you have to justify your figure. When the model is right there, it justifies itself. If your eye is accurate, you will capture it. If not, well, it doesn't matter if you visualize their backside or not!
Do you draw freehand, or with a graph?
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