I want to add, look up French sculptor Jean-Antoine Houdon on Wikipedia (scroll down for photos of busts) https://en.wikipedia.org/wiki/Jean-Antoine_Houdon

A few years ago I saw an exhibition of Houdon's busts at the Getty Center in Los Angeles, and marveled in particular at one of Voltaire, that this very bust was made from Voltaire during his life, and expressed his attitude as an old man!