Raw sienna makes a huge difference to the appearance of the work, making the surface of the skull and the shadows drop back and giving them some age. I’m particularly pleased with the appearance of the skull, although I think it could use a little more correction and observation to the interior surfaces of the mouth; nevertheless the repositioning of the teeth and this shadow work has made a big difference.
I’ve reworked the bones of the spine, mostly using white to bring back the light, with a little redefinition of the dark shadows. Presently the backbone is popping too far forward, so I’ll darken it in the next layer to correct this, while adding the yellowish tint of the Raw Sienna. The pelvis got the same treatment, making the slight turn to our left more apparent.