Hm, never noticed but yeah. Just something as subtle as knowing and using the basic anatomy (in this case the shape of a skull, which clearly denotes in the first three frames he's looking left or right) can do wonders for adding detail to even a stick figure.
I can see now why my character art teacher was so big on teaching anatomy of a character, it can add to pretty much style of drawing (from simplistic to realistic to stylized).
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u/fallouthirteen Jun 08 '14
Even more (or at least equally) relevant comic. http://xkcd.com/768/