Ear

The next stage was to model the ear. I hid the rest of the head and used splines to follow the topology of the ear I created earlier. There were a few problems with following this topology as there were multiple 5-sided shapes. I fixed these and simplified as I went.

I converted this into an editable poly, attached the rest of the splines and welded them together (as with the face). I then begun to pull out the vertices, selecting see-through to follow the reference images.

I continued to shape the ear until I was happy, then applied a turbosmooth to see what the end result would be.

To get a better shape, I used the inset tool to make sharper edges going into the ear in various places.

Once I was happy with the overall shape of the ear, I matched it up with the head to ensure it was in the right place, then entered isolation mode. I extended the edges at the back of the ear to create the shape. I also simplified most of the edges to made it easier to attach to the head.

Once the back of the ear was complete, I used the snap tool to match up the vertices with the rest of the head. I wasn't concerned about the stretching, as it can easily be fixed once the ear was connected. Once everything was in place, I attached the ear to the head, and welded the matching vertices.