Today, my boyfriend told me I looked nice in my profile picture. I began to reply "Aww, thank you!" until he sent another message saying "Mostly because your face isn't in it." FML
Maybe her face is off to the side so people can only see it when they click the full picture. FB uses a cropped version of the profile pic for newsfeed and messenger so maybe he referred to that.
It sounds like a joke to me - depends how he meant it and what your relationship is like. I can't imagine someone saying that seriously. You judge it OP - but I think I would listen to him first :)
Anyways hope he said it in a joking manner and in no way was being serious (: