Do NOT draw "hairy" lines (scratching back and forth). Yan's PDF emphasizes one clean, sweeping line for the entire outside of the leg, even if it misses slightly on the first try.
Due to copyright protections, a free, official PDF of the full 150-page book is rarely legally available. However, you have several options to access this material:
While the original 2007 book Henry Yan's Figure Drawing (Techniques and Tips) is a physical collector's item, understanding the core principles of his technique is the real treasure. This article serves as the ultimate guide to the philosophies, strokes, and structural insights found within those pages, helping you master figure drawing even without the original document.
Henry Yan’s book, Henry Yan's Figure Drawing: Techniques and Tips