I really havent done any charactor modeling so I wouldent know to much. There is a couple good head modeling tutorials here you might want to check them out.
http://www.simplylightwave.com/movie...tml?tut_id=532
This one is free head modeling.
http://www.simplylightwave.com/movie...tml?tut_id=513
This one is free ear modeling.
http://www.simplylightwave.com/movie...tml?tut_id=526