You can use the darkness of shadows to achieve a spooky ambience, but go too far and you get a blind man, like these shots of FPS, Legendary.
The game features a "mix of real-world locations like New York and London, mythical beasties and your typical FPS run 'n' gun gameplay", and you can read more about that in PSW's preview.
Although quite dark, it's actually not looking too bad. Let's just hope it's better than Turning Point: fall of Liberty - developer Spark Unlimited's previous creation.
Atari has been reasonably quiet on this one though, despite it being pencilled in for a summer release (on PS3, PC and 360). Not a good sign...