I've gone for the closed casket coffin. The open version with the vampire doesn't look right to me.
A couple of layers of Dawnstone gets me this...
Then wash with Agrax Earthshade, drybrush with Dawnstone, the Ulthuan Grey; and edge highlight with Celestra Gray. Finally, run some Abadon Black into the gap between the lid and the base - and I get this:
I like it.