I"m reading "The Picture of Dorian Gray" (written by Oscar Wild) Found some interesting thoughts. :
"Portrait would be <...> the most magicall of mirrors. As it had revealed his own body,so it would reweal to him his own soul."
"Sin is a thing that writes itself across man's face. It cannot be concealed."
SO the idea,that face says more truth than we think is very intersting to me. Portrait is like a map open to everyone to read. Very interesting indeed :)