@maplelm Thanks! I would advise "Successful Drawing" by Andrew Loomis, the PDF is here: http://www.alexhays.com/loomis/ (free, but not yet public domain; a new publisher print it on Amazon).
On the dark side, the method and example are a bit old, and the author uses automatically he/him when speaking about artists and that's really from another century (around 1950), but on the bright side; the method is solid and has really good fundamentals, like the thumbnails, the 5 P, and Perspective and Anatomy.