The title is suppose to say 'Cell shading anime hair and tips' but it was too long T.T!
For this one, you will need a general understanding of the layers, and layer features
(This is how i do it)
Its really hard to explain how to draw it since there is not really any sort of step by step process >.<
You just need to place the hair around the head and make it fall in the right places. remember hair has different weights, thicknesses and acts different accordingly.
I will make another tip sheet with a bit more info on drawing the hair itself and drawing male hair as well but for now this will just cover colouring
. You need to know how to pick them if you want a nice finish. Or at least how to edit them? Say for example if you pick a green for the base tone, make sure to change the colour slightly when you pick your darker tone, make it a bit more purple, and say for the highlight make it more yellow. This vary in tone will give the hair a bit more life and it will just simply look nicer and not so flat.
for the gradient effect, add a new layer over your hair and clip it on so the colour stays only on the hair itself, For PS its called a gradient mask. Brush on the desired colours, preferentially a darker for the bottom and lighter for the top. Set the layer to overlay and it should make a nice gradient effect. Remember if its to saturated bring down the layer opacity.
I always play a bit with contrast after Ive coloured my line art, it will just do that bit extra and make the image "pop".
Important note, when using the overlay or contrast features be very careful not to overdo it, since this is a easy way to ruin a nice picture >.<!
feel free to reference the colours but remember to experiment with picking your own ones too!