Now, for indoor scenes there is a slightly different approach.  If it's a totally enclosed indoor scene point lights are best.  One for your main light and you want more for any other light sources such as fireplace, candles, etc.  These are best with Attenuation set at Inverse Square.  Spotlights are also useful but I find point lights easier to work with.   You can experiment with a great indoor scene prop by Flesh Forge, the Render Room which you can get here.  [ http://cid-b233dcaeefa9709c.office.live.com/browse.aspx/Public/Poser%20Freebies/RenderRoom%20Prop](http://cid-b233dcaeefa9709c.office.live.com/browse.aspx/Public/Poser%20Freebies/RenderRoom%20Prop) This render took all of 2min2sec!  Render settings are the same as above.  Lights were 1 Main Point light at 100% intensity, 1.000 shadow.  An additional point light with inverse square falloff and strength at 2% was position to light her face better and a specular only at 75% intensity.  The render room is very fast with IDL but depending on your interior scene it may take time for IDL to calculate.

This was a fast render and I got something funky going on with her eyes but disregard that please :)

Hope this helped!