>>2264040subsurface scattering increases the saturation in the areas where it can be seen. Because of the way the light travels, this usually ends up being where the light rolls over into shadow, or the terminator area. So increase saturation of your midtones. It also happens, of course, when something is backlit, and the light is passing through a thin membrane of material, like ears or webbing between fingers. Again, blast the saturation.
Ambient occlusion, just darken areas where forms get close enough together to occlude light from entering. Increase the saturation too, but not as much as in the midtones.
