Good job! Nice style indeed.
In the second render, I think the chrome bases of the chairs are causing an illusion for my eyes. They look like they are floating 3 feet in the air sometimes. It seems like the shadows don't make sense.
Also, I am curious if you do any post render adjustments here. I think these could use a little bit. They look a little flat and gray, lacking contrast. I would suggest saving renders to hdr and using a good tone mapping program to make the renders come alive. Only one guy's opinion, though.

Brian Looney
Maxwell + RealFlow
http://www.turbosquid.com/Search/Artists/Bubbaloo
Help! I'm dispersing into a haze of probability!