Made some Amazing Ultra HQ Head Textures of "The Amazing World Of Gumball"(AUHQTOTAWOG for Short)
Mind you these are super HQ and are uncomparable to all other textures made do to being in their own league and are considered Divine by gods them selves
I'd try playing around with shading and highlighting, if not realistically, something like some of mind's cartoon head textures. I think you could do a great job