Hi Leadworks.
Maybe you could:
introduce dirt/grime/wear'n'tear into the textures. Everything just looks to clean.
Make the objects more dirty where they meet the ground/ceiling.
Change the colour of the lighting.
Introduce cracks into objects.
Implement Ambient occulusion if you haven't already.
Lower the specular effect on the objects.
Maybe you could:
introduce dirt/grime/wear'n'tear into the textures. Everything just looks to clean.
Make the objects more dirty where they meet the ground/ceiling.
Change the colour of the lighting.
Introduce cracks into objects.
Implement Ambient occulusion if you haven't already.
Lower the specular effect on the objects.