Modeling an ear copyright Giulio Porta 2004. All rights reserved.

The ear is by far the most difficult portion of the human anatomy that can be modeled in 3D.

The ear should be Swept (extruded) from a dedicated face of your model, rather than modeled separately and attached later to the head.

The space dedicated to the ear should look something like the one you see here to the right.

The actual number of points dead ending on the ear shape, mat vary. Obviously more edges can be added later if necessary.

Select the area that defines the ear with the context tool > Point Editing Face
 

In a New side view (Left or Right it does not matter) load a Background image of an ear, and use it as an initial reference.

Imagine a bounding box that has the same aspect ration of the ear. That will help you in  

I rarely use quad views