I had some requests for this after the "Portrait Walk-thru".
About the reference photo: I've had that for... like it seems ever... at least 4 years. And unfortunately I can't remember the original source. It's a child's ear, cropped from a larger photo and the photo was from istock, stock exch... or somewhere like that.
Anyway, I've used it often as reference. so I apologize for not recalling the full source.
I'll delete the tut, if that's a problem.
Hope it helps regardless.
Here are some links for drawing ears. The second one gives some anatomy, too. [link][link][link]