is there a technique for making toon characters less toonish?

Mistara

bump maps?
or
displacement maps?
or
grungie up the skin?
or
?

any example would be awesome!
(my main focus is on the power pixie, mosters cupboard, kirin, hatchling phoenix, Ishoka hair.)

Thanks ! :) trying to standardize a style for a project series of renders.

It's like putting M3 and M4 side-by-side in a render.

Adding M4's displacement maps is a huge-mongus difference, even if it makes him bust out of his clothes.
Is there a trick to making his clothes render with correct diplacement differential?