If you're serious about improving your portrait drawing skills, Stan Prokopenko's Fundamentals DVD is an invaluable resource. With its in-depth instruction, clear explanations, and abundance of examples, this DVD is perfect for artists of all levels, from beginners to seasoned professionals.

Reviewers suggest the premium course is best for those who want:

Including the core shadow, cast shadow, reflected light, and highlights.

For anyone serious about improving their portrait drawing skills, exploring official and legal avenues to access Proko's work and similar educational content is highly recommended.