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I'll give my subjective opinion.
First thing come to mind is some demonic-fantasy type character portrtait, not overdone in size, realistic in parts. Or something alongside with it.
Second thing come to mind fantasy/scifi crossbreed type abstract picture, overdone mostly with bright colours and some clumsy sides
third type is ironic picture of abolutely dissociative picture like Portrait of George Washingtone or works of Rembrandt or portrait of some russian writers/composers. Shopped versions fall into it too.
This is pure subjective opinion other than that i can't think of anything else. Best i can say is probably any ordinary non-gore, soft-gore death metal album covers would work with it. But it is just me, i don't know the context of music, neither story of band or philosophy if they have one behind it.