Its missing some of the fundamental stuff like shadows and the lighting itself could use some work since it doesn't really set a mood or flatter any of the objects. The problem with the shaders in my opinion is that the bump may be a bit too high on a lot of the objects and I have a hard time figuring out what exactly the materials are supposed to be, for example I can't tell if the floor has rubber tiles or ceramic tiles. Not trying to be harsh, just honest critique. It won't happen overnight, keep at it.