Proko has an anatomy and a portraiture course but nothing for the anatomy of the head, especially when it relates to facial expression. So I went looking for outside resources. The book Anatomy of Facial Expressions looks promising but I'm wondering if anyone here has used it? Or if you learned your facial anatomy another way? The link: https://smile.amazon.com/dp/1735039047/?coliid=I2L0D1NEUNYUW8&colid=3MVOZQXDOKDXC&psc=1&ref_=lv_ov_lig_dp_it#customerReviews