Start with high-confidence figure drawing & human form books, then narrow by subgenre or adjacent topics.
The Human Figure
David K. Rubins
Colored Pencil Painting Portraits
Alyona Nickelsen
Classic Human Anatomy in Motion
Valerie L. Winslow
The Artist's Complete Guide to Figure Drawing
Anthony Ryder
Facial Expressions
Mark Simon
Classic Human Anatomy
Human Anatomy Made Amazingly Easy
Christopher Hart
Painting Portraits and Figures in Watercolor
Mary Whyte
Portrait Painting Atelier
Suzanne Brooker
Jenny Saville
Lucian Freud
William Feaver
Lessons in Masterful Portrait Drawing
Mau-Kun Yim, Iris Yim
Drawing People
Barbara Bradley
