This is my painting method; I hope it's helpful. So first,

Then, let's clip the layer we just added.

Then, I'll add another layer.

Then, go back to the clipping layer and paint the hair.

 

 

First, let's add shadows.

Add shadows where the hair overlaps.

Blend the colors where the shadows overlap.

Blend only the tips of the shadows.

Then, let's add highlights.

Let's add a layer.

Then, click here.

After clicking, do this!

Then,

After clicking,

Let's add highlights.

Then,

Let's add highlights to the head.

The color is light pink.

Finished!