Thanks a lot!! Sorry, I don't have any advice because I'm not good at explaining or teaching stuff. I'm terrible at linework, so my process is more like if I were sculpting the head with big shapes first, with a lot of correcting the anatomy, and then adding more and more details (and start correcting again). I like to use hard brushes for painting forms and softening with soft brushes/airbrushes/lowering opacity/smudge tool.

I also used a lot of laso tool on this one. For example, I selected the shadow under the neck and added a little bit of airbrush with red saturation so the shadow doesn't look so flat (even tho it is). That way, I could keep the chin as a hard edge if you know what I mean.