https://www.proko.com/course/the-block-in-course/overview

Are you looking to improve your drawing skills and learn how to create more accurate and confident portrait drawings?  The block in is said to be the most important stage of a drawing. In this course, you'll learn how to use the block in stage to create accurate and lifelike portrait drawings, with a focus on values, structure, and technique.  Through a series of easy-to-follow lessons and exercises, you'll learn how to measure the proportions of your subject, how to block in the basic shapes and values, and how to refine your drawing to bring out the true impression of your subject.  Whether you're a beginner looking to improve your drawing skills or an experienced artist looking to take your portrait drawing to the next level, The Block In Course has something for you. Join the course now and start learning the powerful techniques of the block in method today!

Stephen Bauman - Figure Drawing In Graphite

https://stephenbaumanartwork.com/products/test-product-5
In this lesson you will learn not only about how to draw the figure but also why it is important to study the figure in the first place. Working deliberately through each stage in this tutorial you will systematically address the challenges associated with each phase of making a well organized figure drawing.