Here's the lowdown on ears. Yes, most characters get the
simplified ear but it comes in handy to know actual, real
anatomy. (hint, hint) This image to the right shows the
two most common ears: the first has a hanging lobe and the
second has the lobe directly attached. Other than that,
the ear has the outer helix which shows up quite frequently
in the simplified anime ear.
Above are several views of the ear with the standard ear
plus several simplified versions. From the left: full view,
quarter view, and back view. The back view has no simplified
drawings as it's already as simplified as you can get.