Looking really nice! Loving these studies, I like the way you are constructing those noses

Arch looks good. It's going to vary from person to person as different people will have different chin thickness and mouth width, not to mention different ear to cheek to chin rhythms. I also kind of defines the limit of the entire "front facing" plane of the head box from what I can tell, while at the top lateral angle of the brow you can start to define the limit of the side of the head on the upper part (it tapers towards the inner circle you draw that measures 2 thirds of the bigger circle, and more or less defines the thickness of the upper lateral wall of the orbit)

I'm sorry if I'm being so intense with all this info, I'm going through some info overload studying these things now XD

cheers!

Nice job, these are looking really good!

Woah! The evolution. You have a great grasp on forms, construction and curves in 3D I am really digging those doodles

Head constructions are looking very good, just watch out for the foreshortening with extreme angles upwards/downwards as it can make the face look compressed rather than foreshortened if you don’t consider the 3D topology and overlap that occurs

Keep it up!

ur art and lineart is so prestine!!!! such crisp lineart!! and daem the shading is amazing!

INCREDIBLE!! looking at your work is so satisfying the creativity is amazing!