I have this idea.
Cover with a nice border and a black background. On the bottom you have the title. In that pitch black blackground only 3 thing light up. The 2 green/blue dragon/ghost eyes an below that a small flame. In short: a head on (apply directly to the forehead) shot of a dragon in the dark where only the eyes and a small flame from the mouth is visible. (I'll try to make a mock up). Gives the game a kind of mystique.
edit: just made a mockup, it was better in my mind

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Maybe the left eye can light up a bit of the human face and the right eye a bit of the dragon face.