Also, if they were so different in appearcance why would they be considered beautiful by other societies, for example Athenian society?
While you wait for a specific answer, you might like /u/chocolatepot's answer to How attractive would wealthy ancient Greek or Roman women be by today's standards?
/u/cleopatra_philopater's answer on Spartan women in this thread on Greek sexuality will probably also be interesting.
It really isn't what you probably think...