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Hi! First tutorial, and have been playing with this effect a lot. Here are a couple of my tries:
Okay, so first off, find an image. You'll have to use one with an open mouth, I googled something like 'teeth smile' or 'open teeth smile'.
If you're gonna change the color of the lipes (i.e. give her lipstick) then it also helps to have an image where they already have some on, so it's easier to see where the line of color that you make should stop.