ok, first you need to copy and paste a good base onto MS Paint. Then you need to zoom in with the magnifying glass( which i cant show you zoomed in, but its way easier)
Then you need to start drawing the outline of the hair with the pencil tool a bit further away from the head.
Next draw the other side like i did, or you can copy one side rightclick on it go to "flip rotate" and paste it on the other side.
Then fill it all in with the paint bucket tool.
Now its time to copy what you have, and paste it onto adobe photoshop. zoom in with the magnifying glass.
Next, you need to use the dodge and burn tools. click on the dodge tool, which i have circled, and drag your mouse to the right, click on the burn tool
use the burn tool to darken the edges, the part line, and a line every few spaces so it has texture.
Drag your mouse to the right over the burn tool again and click on the dodge tool. add highlights.
Using the burn tool, darken the part line the bottom of the hair, and behind her head.
use the dodge tool to add shine marks, and in a few spots where you want.