It is a good exercise for beginner artists to focus on the actual shapes they see. Your brain keeps trying to reduce things to symbols, and this is a good way to disable that and see the real shapes, copy them onto your page, and see the image re-emerge on your page.
It can be a good tool for drawing from memory also: first, memorize the negative space shapes, and as a second step, memorize the details inside and draw them too.
It is fun and useful to memorize a reference in steps, to draw and refine it repeatedly. Drawing the outside, the negative space of something, first, can be a good first step.
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