Take some putty about 1mm thick and roughly the same size as the area to be covered, flatten it between your fingers and apply it to the area by gently pushing it onto the figure.
Smooth out the putty making an even surface using your sculpting tool and clay shaper. Be sure there are no air bubble’s or seam lines and that the putty is thick enough. If there are any areas showing through you must pinch off a small amount of putty and apply it to the surface.
There would normally be a slight hollow under the pectoral muscles. Add this contour by gently running your tipped clayshaper underneath these muscles. You want to create a smooth hollow.
Now add the surface details. Start by taking your exacto blade and faintly cutting a grid pattern of horizontal lines about 2mm apart down the area until you cover it. This is your rows of rings.
Now you need to add the rings. Take your pin tool and gently poke holes along each grid line. Continue filling each row with rings until you have completely filled the entire area.