An Old Friend.

[failedALIAS]

The environment looks awful for this sort of thing(any sort of thing actually). You want it to take place in a hotel, in the woods. First off; In the hotel part(I'm going to assume there's some "Super-Secret underground thing") it should have very limited space, and look shitty as hell: No long corridors, or and shit like that. In the first picture alone, the room appears to be an empty box leading to a giant flipping corridor for Pete's sake! The second picture looks pretty bad too, with a similar problem; empty room, holding only the absolute necessary. All you need to do to make a believable environment is to think realistically; What should a room like this normally contain? How can I make it as immersive and real as possible?

Remember that this is not a place constructed to be frightening(well, because you're making it for a horror story, it technically is, but it shouldn't appear to be such). It has a particular purpose like everything else that's built. Apply realistic thinking and you'll be amazed where you can go.