This is a study done by Gist. The highlights and shadows, whether they're subtle or dramatic are just beautifully done. You can tell he was really paying attention to his model's anatomy and that he was drawing from life, just because it is portrayed so accurately. I wish the weird background shading wasn't there though.
Gray's Anatomy - Posterior surface of the forearm. Superficial muscles | classic anatomical illustrations
E. M. Gist Illustration/ Dead of the Day: Life Drawings & Demos (March 2011)
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