You can find these books through several retailers if you're looking for the full, physical versions for study: Portrait Techniques Made Easy
Focusing on the relationship between muscles, bones, and facial expressions to create lifelike characters. Where to Find the Book and Resources aditya chari portrait techniques pdf free
What makes Aditya Chari’s portrait techniques so sought after? Unlike the often stylized proportions of comic book art or the rigid geometric decomposition of classical academic drawing, Chari’s approach is pragmatic. You can find these books through several retailers