Recess texture

Clay brush, spray stroke, Alpha 07, Zsub

Prepping for ZSphere sketch from profile reference

Prepare a jpg profile view preferably with skeleton ready in square aspect ratio.

In lightbox (,) go to tool, image plane, poly plane (double clicks)
Deformation > rotate > 90 degrees Y axis
Divide, divide, divide (or the image will look crap)
Standard brush, drag rectangle stroke, load alpha image of profile view.
Zplugin > projection master > tweak settings and 'drop' (need to activate reverse side and polypaint).
Drag rectangle to place image (drag from center out to bottom right).
Zplugin > projection master > 'pick up'

Append ZSphere.
Transform > activate X symmetry.

Make ZSphere model.
Make low poly adaptive skin.
Transform > activate X symmetry and tease out shape.