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By using the power of the Dark side, we can easily color under line art to achieve a very nice outcome.
How many times have you wanted to color line art in the gimp? I scanned this image in and followed tomcat's tutorial to get it to look right (looks way more inked than the original, but thats better for what we're about to do), and I decided that it should be colored. So the question is, how do you color this in without going over the lines, or doing something like (really bad idea) Select by Color and erasing everything thats not black? I suck with shading, btw, so don't even bother telling me that ;]
Open your black and white image (girlie.gif in my case), create a new layer, call it `Color Layer` (or whatever you want, I would recommend many many layers for the colors). Now duplicate the background layer, and set this layer to `Darken Only`, thats what makes this trick work =]. Fill the background layer with white. You should end up with something along the lines of that over there... (/me points, really, i'm pointing)
Now, just start drawing on the `Color Layer` with the pencil tool and whatever color you want. At this point, you're drawing under the top layer, which by the magic of the gimp can only darken whats underneath it, and over the bottom white layer. By using `Darken Only`, you don't have to remove the white areas of an image, because they won't affect anything underneath that layer.

Hope you have fun with this, Happy Gimping ;]