You can totally use your own face to study and understand what you trying to do and then you could apply it to your subject If I can suggest something key the the mouth is the corner form where all muscle connect [the node modiolus] so if you place this form in it correct relations then you just have to wrap lips tightly…
Had some time to work on the head. There's a few areas I still want to refine such as the cheekbone area, also the nose bridge needs to be higher I think? I'm trying to get a kind of neutral look, but she looks a little intense, I'll play around with the nose bridge area to see if that helps... but I feel it's pretty much…
Very nice work here! I can see you are making great progress. As for the facial muscles carvuliero is talking about maybe these reference will help: Getting those cheeks right it HARD! I had to get a 3D face scan to study those more. Hope this helps! I feel your pain! Also small note for the way your character is standing.…