Quote - nice example from BionicRooster. Just to reveal the main points

Thanks aRtBee.

I did multiple renders, starting with lower hair densities, until I got to a point where I was satisfied.

Applying same texture to the skin helps a little in that aspect, as it fakes some of the density up until a certain point.

As for hair on a person's head, you'll want to keep skin texture under hair for realism.

                                                                                                                    

Poser 10

Octane Render

Wings 3D