Hi everyone,
Here's a new art tip for understanding the structure of lips. If you think of the masses of the lips as 5 spheres, it makes it a little easier to study and draw. It can also help with the lighting. Once you become comfortable with the structure, this all becomes internal and you don't need to draw the spheres and can go straight to the lines.
Let me know if you have any questions or art tip requests.
Thanks!
-CriKai