My sketch study of the famous David figure. Instead of using the Michaelangelo statue as a visual source, I used a da Vinci sketch. The origins of David began as part of a series of commissioned religious pieces by Donatello. Donatello died before he could render anything but the absolute beginning of formative sculpture. The hulk sat for over twenty years before young Michaelangelo, himself not much older than Donatello's first cut into the marble slab, earned the commission to finish the statue.
Leonardo da Vinci sometimes acted as advisor to Michaelangelo, and produced his own sketches of how he thought David should look. Although similar in pose, da Vinci's David differs from Michaelangelo's in several respects, and seems to be a cruder version of the ultimate masterpiece. My sketchwork... cruder still.