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Big Guide to Drawing the Body by ^Cedarseed on deviantART

Very detailed. See the full version at deviantART (I can’t link to it directly). The site also has a great chart showing how to age characters, and a cool nodally-linked display showing subtle shifts between emotional states, all starting with a neutral face. For example, the face does different things on the blank-relaxed-lazy path, as compared to the blank-relaxed-peaceful path.