i quite like it at the moment, but i think the floor should be a bit darker. I think it could also use a highlight to go along with the shadows. I like the pattern on the floor though - but it looks a little flat as is.
Also, the east and south wall shading should probably be on the other side to keep the lighting consistent from the north west
I made a quick edit:
i changed the black to a DAAAARRRK red, fixed the wall lighting and darkened the floor and put in a highlight - i added a colour for the shadows.
this may be darker than you wanted, but i think it shows a little more depth between the walls and the floors.