I think this figure drawing, the work of the Colmar Painter and dated to 510 BC, is absolutely perfect. The tondo is from the interior of an Archaic Greek kylix, a drinking cup, which is in the care of the Walters Art Gallery. As the cup was drained the painting would be revealed and was meant to amuse the drinker. An accompanying inscription (not shown) reads “The boy is beautiful”.
This drawing shows the sort of style, elegance, and “rightness of purpose” I try for in my own work and I don’t think I could find a better model.