this scene looks allready pretty good. you might considder using bumpmaps on the floor and wall. also I would change the checker texture to something old (maybe some 70ies pale greenish or brownish pattern) but that´s a matter of taste. what about atmosphere? maybe add a partivolume and get some little stuff into air like insects or just dirt which scatters light. the overall look is too clean yet I think. also I´d give some light to the completely dark spots in the front.

and personally spoken a strong and crisp contrast within lighting gives me the creeps.

good work!