Hm... while I'm happy that your tutorial is as easy to understand as always, there's something that I'm missing with the ears this time. Namely that you only gave tips how to draw an ear from the front. To tell you the truth I think it would have been a tad more helpful if you also gave a few tips how to draw them from a side-view and from behind since it's easy to find reference for drawing ears from a front-view (e.g. looking at your reflection in the mirror, most pictures and so on) but not so much with the last two perspectives.
Maybe you should actually tell people that ears comes in many different shapes. Just not this one. I believe that you kow that, but others might not. So you should say that this is not just ONE way of drawing ears. So they don't get stuck in the rule that it has to look like this. Just saying. ^-^