I am not very good at this. Here's a work in progress. I think I got the topology reasonable enough (after hours of struggle) and now I've got something which aligns beautifully with my side and front references and looks like an alien horror show at an angle. Well, I think i've gotten the jawline and the nose and lips okay. Bridge of the nose definitely needs to be wider, I've no idea how to shape the brow ridge and forehead and how to size the back of the skull. And I'm hoping that when I actually add the big anime eyes and eyelashes and so on that it looks slightly less terrifying...