Nice rendering! There are maybe two points that could use some attention, if you don´t mind: The bloodstains are unnaturally red IMO and the room looks pretty well cleaned up. Some rubbish and debris, maybe a broken lamp, generally some irregularity in things might convey a sicker, more chaotic atmosphere...
Another thing that I found a little confusing at first is the perspective. The camera/observer seems to be just underneath the ceiling, making everything look rather small (most obvious in the computerterminals I think). A lower viewpoint might make the scene more menacing and intimidating. Might be just a matter of taste though.
Other than that, great work!