Personally, I would like to see a more horror end to your terrain, as right now I just dont even slightly get the chill's from viewing the terrain. To me it's just another dark corridor in some slightly scary game or something. I'm not entirely sure how you're going to pull that off, might have a silhouette of something dreafully looking in the distance, in the shadows. Or some kind of monster thing dangling from the ceiling, or even, climbing in it, towards the camera. Be creative! 
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