>>6009804The most sober approach to this that I have ever seen was Deconstructed: Drawing People by Viktor Kalvachev on schoolism.
It was also great for rendering in graphite but that is beside your point.
Take a look at that and also the recordings of the old Robert Beverly Hale anatomy lessons at the Art Student League of New York. He goes on and on about proportions and most cannons used today are in a way or another based on his system.
But again I would recomend going though Kavalchev's course before.
And on the rendering aspect be sure to understand light and value first [Mastering Light and Form with Dorian Iten, The Shading Course with Dorian Iten OR Secrets of Shading by Steven Zapata] go over the generals of how light and color work [Light for Visual Artists by Richard Yot, Color and Light by James Gurney OR Fundamentals of Lighting with Sam Nielson] and then you focus on your particular way of rendering flesh/skin because there isn't really a rule, everyone can do it differently and if it reads it works.
I would advice you take a look at material rendering courses and portrait painting ones:
Clint Cearley's Painting Materials Course
Understanding Textures with Jonathan Hardesty
Realistic Portraits with Jason Seiler
Portrait Painting for Beginners with Joseph Todorovitch
Portrait Phase I, II, III and IV at the Watts Atelier
