The first image has some unusual artifacting, you said that you didn't edit these so I doubt it was from over sharpening but I wanted to give you a heads up that your jpeg compression may have been a bit extreme. This is a neat set up and all but there are a few things that bother me, the clean white shirt with smudges on it, the (what appears to be) cloth wood backdrop, and the tools floating in the middle of no where. Lots of potentially good things, just very far from each other. The white shirt could have been run through dirt piles and shredded with a razor to give it more of a used appearance, maybe the tools are laying on the ground with blood dripping off, maybe create a fake blood mixing in some motor oil and coffee grounds to make it chunkier so that the blood on the walls feels like it has some mass.
I guess really I just would expect a horror shot to involve a little more horror, more dramatic shadows, a little fear, some real grunge.
Awesome set up, very big room, lots of possibilities but it looks like you stopped before you really got the ball rolling! I know something this large is difficult to pull off with a small budget, however working with a smaller area you could have made it feel a bit more horrific.
By no means am I saying you did a bad job, I just see you obviously gave this a really good go and I'd really like to see you improve next time.
