The glossy floor makes it really hard to read at once, it looks like a continuing wall. I'd drop it if there's no compelling reason for it (or try to suggest it in another manner).
Snader's edit improves it, but not totally, as the light is conflicting with the volumes: the floor next to the windows should be brighter than elsewhere, all the more so that the other light sources look dim.
The diamond pattern would help a lot, too, as it would create an immediate and obvious distinction between floor and walls.