All my drawings
No, really, literally all.

Head construction

Head construction

Studying head construction.

Top diagrams are from "Fundamentals of educational academic drawing" book by Nikolai Li (in Russian: Николай Ли, Основы учебного академического рисунка).

Bottom are from "Fun with a pencil" by Andrew Loomis.

Months of drawing: 5
Original: 3507*2480