First, for a simple 3 point shading design, put your lightest shade of the colour you want in the places I have marked out on the left here (The places I marked on the front and back of the hair hanging down from the head is just for this design, you can do any design you want).
*click me!*
*click me!*
From the light areas, gradually fade through darker shades towards the edge of the head.
*click me!*
*click me!*
I removed the grid, so you could see the effect, but you should end up with a cool shaded effect on the hair.
*click me!*
*click me!*
Now, for the fringe! You can do pretty much any design you want on the fringe, but you want to start off with some light points,
like on the hair itself.
*click me!*
like on the hair itself.
*click me!*
There are a more shading styles than just this one though!