The next step is the eyes. Create a new layer named "eyes" and select the pupil area of the eyes, remembering to leave the shine-spot unselected. Then fill with a base color and use the airbrush to shade and highlight it. I put a small gaussian blur on the layer to make is seem a little softer, and I added a gray shadow under the eyelid.
To give the lineart a smoother, more natural tone, I selected the lineart layer and went to Image<Adust<Color Balance until I got the approximation of a dark skin tone. What we want to do next is the hair. This is a little more tricky. Create a new layer called "hair" and using the Polygon Lasso Tool like before, select the hair area and fill it with a base color. Then, create a new layer caller "hairshadow" and using the polygon lasso tool, highlight the area you want the shade and fill with a shadow color. then after deselecting, give it a gaussian blur (I used 4.8 pixels). Go back with the airbrush and touch up and problem areas.
Go back to the "hair" layer and use the magic wand to select all the hair area, then go back to the "hair shadow layer and use the airbrush to fill in the darker shading.
Then do the highlights. Create a new layer and name it hairhighlight. Use the Polygon Lasso Tool to select the area you want to highlight, and fill with that color. Then do a Gaussian blur again. Double click on the layer to get the Layer Style menu. Set the Mode to screen, This makes the highlight glow a little.
At this point, doing the clothes is the same as the rest of the coloring, so I'll just skip ahead to the finished version.Just remember to keep making diffferent layers for each area you want to color and to keep the lineart layer on top. Here is the final product, a quick easy CG job that took about 1/2 an hour. Next to the finished picture is a display of my layers, yours should look something like this.
Here's another image I made using this technique that I spent a little more time on. Hope you enjoyed this tutorial. Next time, Photoshop screentones! Hurray!