Rather simple construct done in TopMod, but I quite like it. This version doesn't have a hollowed out core, mainly because I couldn't decide between which model to use and in this case the inner core adds contrast to the subsurface scatter effect on the thinner areas. Material is diffused with a bit of subsurface scattering. Sky sphere is the Preetham et al skymodel. Camera model have been changed to use photography parameters. All rendered in my own render.