Thanks for your nice comment! Well, I'm happy with the result of my experiments, but the faces still far away from be perfect. Even delimiting all the areas in the start image. The noses and ears are just impossible to control... plus random stuff, at end the AI can decide ignore the shape of an area and expand and transform it as wishes. Next thing I want to try, is use just line art, without any kind of shading, and see what happens. Hope my findings gonna be useful for you.
Regards and don't forget your !PIZZA!