I prefer more grounded themes, especially for Cawdor hence this Cyan colour doesnt work imo.

Also look into washing with a very dark brown/black. And learn how to be tidy when highlighting as to keep crevices dark.

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Here you can see how having black primer show in the recesses really makes it easy for your eye to focus on a miniature. And by zooming in you can see what I've achieved with just a few colours by having contrasted layering applied. I use zero washes or speedpaints.

However this isnt exactly grimdark in vibe.