These aren't really 3d concepts, they are finals based on the 2d concepts, but I thought you might enjoy seeing the comparison. Alot of times compromises create diferences between what you will do in 2d VS. 3d. When you start a visualization you should keep in mind what you might be giving up idea-wise for the sake of the medium.
A few notes: The mummy is supposed to be a hig warrior priest that is preserved into undeath voluntarily to defend ancestral tombs. The skeletal drake is undead as well, however in the lore which spawned the idea they have bones of iron - hence the rust.