I agree, hair is not hard it is more a matter of patience and lots of layers. Don't forget that hair grows on your head in such a way that you see many layers when you see hair, so the light and the wind conditions are important...even with thicker hair you eye is looking for the strands to make it "realistic". I get that by also using many different layers, then changing the layer characteristic between luminosity, multiply, darken, burn, overlay etc. you would be surprised what screen can do to add depth to the hair...or to give that halo of strands look...keep posting your progress!...