https://www.nma.art/videolessons/painting-a-female-torso-in-oils/

In this video lesson world-renowned painter Steve Huston will paint a torso, showing how the human can be expressed in terms of basic forms, the torso being mainly cylinders and ovoid or egg forms. Steve will go on to demonstrate the use of tone, value, and rendering to create simple forms with shadow patterns, half-tones and gradation in order to bring your painting to life.