The unusual illustration above was created using Photoshop's "trace contour" filter. This feature in Photoshop traces the areas in the picture that have the most contrast in value to each other. Very interesting... This is helpful in showing where the shadows and highlights are in the portrait, in a weird, abstract kind of way.
Here's the picture of Bill in living color. Is it now a little easier now to see the basic shades of light and dark in the picture?
Don't get caught up in the just the colors - squint your eyes and try to see values of light and dark. Look for the dark, light, and mid-tones. When painting in color, make sure that not only is the color accurate, but that the value (lightness or darkness) is accurate as well.
To learn more about the specifics of shading, read the "Shading Explained" tutorial. >>
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