Emmanuel-
I know exactly what you mean! IMO, the eyes are naturally drawn to the face. So, a well sculpted and painted face will really add to a not so well sculpted figure.
The pz commander in my gallery is a Hornet head tacked on to a DML figure with some slight mods to the arms. On the other hand, you can't paint detail where there isn't any. And, that was the case with the DML body...
Keith