We will use the following colors:
Green, cerulean blue, sienna brown, vermilion red, and pale yellow.
We'll use #3 and #5 long-haired brushes.
Now we'll paint the hair.
Start by applying water to the area you're about to paint.
Then paint it brown, starting with the upper lines.
Dilute it using the water brush.
Repeat for the shadows located behind and below the ear.
Then mix in a little blue to get a darker shade of brown and to emphasize the contrast.
Use the same technique again: first apply the color, then dilute it.