I'd work the other way - start with a slightly lighter color (something like dark reaper mixed with black) and wash your way down with blue and black washes; maybe even some crimson in the wash. It's just that the washes will easily darken the recesses, and you can get some gradients with little effort.
If you want the bloodthirster skin to pop a little more than that one, drybrush it really lightly with something like daemonette hide (or thunderbawk blue).
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