Delineate Your Lips tutoriel pour les lèvres - 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 a step by step tutorial on painting realistic lips. Although this is digital painting, the same principals apply to traditional painting. Tutorial video here:
I've had a lot of requests for a tutorial/steps for how I paint. This picture wasn't done with a reference, so a referenced eye would be even more photo. How to Paint Realistic Eyes Tutorial