I used this stencil I got from a stenciling site...
and uploaded that photo to the knitpro graph making page at microrevolt here...
For the grid size I checked off the third box, (XL (120w x 160h)
and kept the stitch size as it is, (Needlepoint, Cross Stitch, Crochet (1:1)
Then I printed out the new graph. I changed it somewhat, (like I didn't want her white streaks to go completely around her whole hair; just the sides).
You can use a cabled afghan hook or, if you know how to single crochet and change colors, you can do it that way too. (But that single crochet way will be much more difficult as you will have to keep flipping over your afghan after each row and read the graph left-to-right then right-to-left etc. Plus, with color changes, it becomes really tricky to single crochet and have yarn ends hanging on both sides of the afghan as you stitch.
I much prefer the tunisian (afghan) stitch as the front side of the blanket faces you at all times and you always read the graph the same direction for every row.
Thanks everyone for saying such nice things!