Hmm...
Most of the time, no matter what you do, the hair will always look fake.
That's not anything to do with the render settings, but with the textures of the hair, with the way the mesh is done, the transparency etc. (not necessarily all of them at once, but if one is not up to scratch, it will let the render down.)
I find there are very few hairs out there which render realistically.

There are ways to improve hair renders, but I think you'll have to adjust the settings on each one individually, because they are vastly different in setup, unlike the underlying figure for the skin.

But hey, I could be completely wrong. :)

Silke