I did mostly practice with drawing a lot of lines in parallel, filling a good 6 pages full of that per anthroanim's suggestion to get my whole arm more used to drawing things vs my wrist (a bad habit I have had forever). But after those 6 pages were done, i went back to trying to draw various species ears from jacfox's example sheet he gave me at MWFF 2013.
If you care to see the million crappy lines I was drawing and how they got better/different as the pages went on, I got them at: