Here I am adding more detail but maintaining my light and dark passages. I start to clean up the edges of the hair slightly.
I am adding some color into the shadow side of the hair while trying to keep the value relationships compatible. In other words, I try not to get any lights into the darks or any darks into the lights.
Adding more detail. I am beginning to add reflected light into the darks of the hair. Still, trying to not paint individual hairs. I forgot to mention that for the majority of my work, I have my opacity brush setting between 15% and 35%.