this looks like it shows what application you know best, not which is the most realistic.  imho, i personally have gotten better results out of Poser 6.  i've seen people using bagginsbill's new props, lights and shaders who've done much more realistic works than i have.  heck, i don't think i've seen anyone, including Fabrice Delage, beat Faaeria's V4's (example).  i've also seen people post more realistic results out of Carrara with (according to them) the default lights. 

but then, if this is supposed to be indoors, i'd expect to see some directional light.  not that it necessarily is (i can't quite tell from the scene), but even outdoors i'd expect the sun to provide some directional lighting unless the weather is supposed to be completely overcast.  which is kind of a special situation.