Wow. That is extremely sexy. I'm not sure what to suggest, I can't come up with stuff like this...I think you should put in little clocks floating around, but you're welcome to ignore that. I can't wait to see it after you've added stuff!
You could try adding some overall shading to the entire piece, such as from one side/corner to the other, or even from the middle, outward. It doesn't need a lot, because it is mostly flat, but a little subtle shading might make a considerable difference.
drawn in 56 min