So after looking at my faces so far, I decided it was time to get my old friend charcoal out and aim for softer lines and more depth. Here are two quick studies.
I'm working from references, rather than doodling, though these two faces look very little like the originals. I need to find more interesting faces of all ages and genders to work with and push myself out of my comfort zone, though. I actually tried drawing a male face, too, but it was such a disaster I'm not posting it here!