I've seen this photo before. Before the drawing. [Personal work, 2013 -Cameron Stewart spectacular illustrator, wonderful mix of black and white control and crosshatching shading, especially with hair and background]
Delineate Your Lips The Etherington Brothers - How to draw lips correctly? The first thing to keep in mind is the shape of your lips: if they are thin or thick and if you have the M (or heart) pronounced or barely suggested.
"This is soooo good! She titled it "Sketch." How is it just a sketch? :o Ahhhh sooo jealous of her drawing abilities! Her name on deviantart is if you'd like to check out more of her work. It's PHENOMENAL. :o" I'll check it out