Sometimes I´am writing about things that are great but are not that closely related to the overall theme here at ghacks.net. The approximately hundred drawing lessons at drawspace.com are one of those exemptions. After a free registration you may view a drawing lessons in the beginners, intermediate or advanced class.
All three classes contain categories like Draw with lines, Perspective and Faces & Figures that contain a number of lessons that fit into that category. You find for example Leg & Foot and Facial Aging in the Faces & Figure category which is an advanced class. Selecting a lesson brings you to the lessons main page where you find in depth illustrations that explain the concept.
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Thanks for the link. I’m an art teacher, and some of these could be made into pretty good drawing lessons!