Well, I always draw in oekaki shi but I guess it wouyld be the same for most applet...but anyways, I just dab on a base color (doesn't matter if it looks bad...It's supposed to be messy.) Then, select a lighter shade of that color, lower the opacity, make the brush size very small, then make bunch of stands. on the hair. Repeat this step selecting about 2 other shades. Next, choose dark shade or black, still small brushed, and make the stands where it is dark. Then, choose white, thicken the brush, slightly higher opacity than before and make the strands where the highlights are. Then, erase the excess color. And finally, make bunch of strands hanging off. Check my gallary for what it may look like.