I'm not an IDL expert, but if you're doing indoors, I suggest extra lights to make it more realistic, none of us has only one light source at home or where ever you indoors. I've seen IDL indoor scenes that rely on one light source only and they just don't look real.

When mimicking a studio for portraits, I'd suggest having a look at the Poser 8 lights AO or Studio Lights / Studio Lights AO. They're in the lights folder of Poser 8, 9 and the Pro versions 2010 and 2012.

I've found those to give interesting results. You can adjust them, add other lights if you want to. I'm not sure if they work well with IDL, I've only used the without turning IDL on. Experiment, see what works best for you.

Artwork and 3DToons items, create the perfect place for you toon and other figures!

http://www.renderosity.com/mod/bcs/index.php?vendor=23722

Due to the childish TOS changes, I'm not allowed to link to my other products outside of Rendo anymore :(

Food for thought.....
https://www.youtube.com/watch?v=pYZw0dfLmLk