Some node alterations can make all the difference, here is an old pic that adds noise that can be handy in controling painted hair highlights. This pic is old and I know noise is widely used, but I'll add it anyway.

Here is a thread on lighting that might help some, though not complete.
http://www.contentparadise.com/forums/showthread.php?t=3607

Hope this helps.

-Anton, creator of Apollo Maximus
"Conviction without truth is denial; Denial in the face of truth is concealment."

Over 100,000 Downloads....