Sculpting the Forest Spirit - ZBrush Creature Design: Creating Dynamic Concept Imagery for Film and Games - page 491

Figure 8-58: The first bony landmark will be the clavicles.
1. Select the Clay Tubes brush from the Brush menu. Turn off the alpha and dial down the ZIntensity.
Sketch in the sternomastoids and clavicles as seen in Figure 8-59 . I also build up the chest fat over the
pectoralis muscles and tug it down with the Move brush to add a sense of sag to the area.