For a really good final render pass, you might want to try using SOFT Shadows, especially in you have say an indoor-nightime scene  that's low-lit. Checkout 'Lack Of Imagination' in my gallery to see what I mean. 
I compared my actual desk lighting to my render and realised that the shadows on the wall were too harsh. Soft Shadows in the RENDER Options d/down fixed that.

I'm sure others will be along shortly to add something....

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...