I think S2Engine has a good idea there, strip the diffuse textures off the materials and take a look again, you may get a clearer example of how your reflective materials are working and a nice showing of your lighting...
Cool idea, I kinda feel like since you're just using that model as a test, it might be better to use a flat white color for the diffuse instead of the brick. That way you can see more how the lighting looks and also keep focus on the reflective areas rather than the temp brick.