I think your renders are lacking a little contrast. Your colours look a little muted and dull to me. What renderer are you using? Are you using some kind of GI or fakosity?
If it is Maxs, I would recommend downloading one of the free radiosity/GI renderers like free Vray or Rio from Splutterfish. Set up a simple interior scene and render with GI to get a feel of how the lighting will distribute itself and then try to simulate that with fakosity. You'll see that the lighting isn't so uniform and that colours bleed onto other surfaces.
Goodluck.
Victor Erthal, your website design is REALLY cool
and quite inspired.