I did this in photoshop, and I hope this helps illuminate how-
1st, I grabbed the photo of the fury on this site, and pasted it into a blank page on photoshop. Then, setting a transparent layer above it, I drew this line art on top-
Note, since the photo is so dark, and it's hard to know where you're lying down black line, I actually drew it in Neon Green overtop the photo. Then, once the line art was done, I converted it to black.
Then, I inserted a new transparent layer between the black line art, and the color photo, and by using the eyedropper tool, picked up local color, and drew fields of color using the lasso tool (not the polyginal lasso tool), filling it in w/ the paint bucket. The color layer, if I stripped away the line art would look like this-
But you don't actually see this while you're working, as that's taking place under the line art. Once I was happy w/ it, I discaded the photo layer, cropped it to a nice composition, and here you go!
helped me learn how to use photoshop too