well since everyone told you it's nice/clean/sicc etc.
i'ma give some critisism ,
the two greyscaled 'figures' should get a more 'ghost' like feel to em , try duplicating the layer , put al ittle blur on em , blend it on color dodge then tweak the visibility.
it ain't complaining , i like the cover how it is , just saying how it could be better........ in my eyes.
pz's.