Clea and Elke are great friends, how are they different?

Although Clea and Elke are both artists, they have very different personalities. Clea is a successful photographer with a picture-perfect family and an exciting extramarital life. She is described as a sorority girl gone wild — good looks, good clothes, and good luck, and amazingly enough, a good marriage to Turner, an overgrown frat boy become international businessman. Elke, on the other hand, is a shy, serious, haunted sculptor, who is married to Terence, a protective but possessive intellectual whose antisocial tendencies are as pronounced as are Turner's social ones.