Maybe do a female head bust to vary it up. I think as long as you really try to catch different heads and shapes it will be hard to get in a to bad of a habit.
Starting on a first fully modeled character with clothes! I feel comfortable enough to get into this now from the practice of creating the textures for the book and Bishop bust... Let's see how it goes :D WIP Ooh and here's a RedditGetsDrawn I recently made