Here's the lowpoly version, textured and posed (pose02).
Playing with semi-cell shade with Arcane inspired influence.
The illustrative ink lines were textured into the diffuse.
Mimicking what Blender does ... a cheat for implementing into a Game Engine.
I did duplicate the mesh(es), inverted the normals and applied a dark outline material.
All renders in Marmoset Toolbag 3.