looking at the posted renders there is just too much to 'correct' on it and without seeing an actual mesh shot i cant even tell if it would be viable.

i already spend weeks reshaping a mesh to flow better and have proper anatomy and a more appealing shape. if i have to take that even further and bog myself down with completely reshaping small things we take for granted such as inner ear geometry, lacrimals, geometry at the corner of the mouth, navel, fingers, etc then why should i even bother? at that point it would be easier to just model the thing from scratch and be able to control geometry with a low-res sub-D control cage than to suffer with moving vertice by vertice of an improperly modeled ear. 
not to mention that once you have made such radical changes in a mesh topology it generally needs to be re-UV mapped to eliminate stretching, at which point again i must ask if ive moved every vertice and UV mapped it, why am i even doing it?

body shapes, facial characteristics, etc change from person to person but basic anatomy doesnt. the bodies are definitely salvageable but the heads should be either cut off and redone or be refined at the mesh level by the creator to have more anatomically correct facial structure.