Thanks guys!
to paint this one similar to the studio colors, I did a base of graveyard earth to the skin (and later all the spins) then washed both with badba black. I painted the majority of the highlights etc with graveyard earth, then started adding pure white in probably 4-5 layers, using liberal amounts of water.
The spines: same method as the skin except I started highlighting with bleached bone till it was pure bleached bone, then a little bit of pure white into the mix for the final highlight. It was time consuming!
The scales were scorched brown highlighted up with pure white and then a very light badba black wash. Hope that helps!