For the life of me, I cannot figure out how to control what picture is used as my contact picture on other devices. For example, in the Find My Friends app, I can see my own account picture. However, on my wife's device the picture is something completely different. It is a picture that I have used for accounts in the past, but it is neither my current Apple account picture or my Facebook picture or my current Google account picture (just assuming that's the other source of account pictures that Apple may be using). So my broad question is: where do the pictures for contacts come from? Specifically: How can I change/control what picture is associated with my account so it shows up correctly on other devices?