Drawing Critique: Constructing and Drawing Convincing Lips

A drawing critique (of a portrait mastercopy submitted by one of my students) focusing on constructing and drawing more convincing lips.
If anyone is familiar with the artist of the original drawing, please let me know! I have been trying to track them down.
You can watch the rest of this critique, and many others, in the Drawing Critique Archive here: thedrawingsour...
*More Lip Drawing Resources*
Step by Step Lip Drawing Tutorial:
www.thedrawing...

[@ZuDav-o2f]

Oh yes, 3D is the best way to show planes of any object, thank you!

[@TheDrawingSource]

My pleasure, I'm thrilled to hear that it's helpful!