Change people’s pictures in apps on Mac
You can add or change your picture shown in the login window and in various apps on your Mac, and choose pictures to use for your friends, family and other contacts.
Your user picture
Change the picture that appears next to your name or another user’s name in the login window.
Your picture in Messages
Other people see the picture they have stored for you in their Contacts app, and you see the picture you have stored for them in your Contacts. If a picture isn’t available, a monogram is shown.
Your picture in Mail
Mail can show a picture for you and for people who email you, depending on the pictures that are available in the Contacts app. The pictures are shown only to you; they aren’t included in your emails. See Show people’s pictures in Mail.
Pictures in Contacts
Include your picture in your contact card. You can also use pictures of people in their contact cards (the pictures may appear in other apps). Your contacts don’t see the pictures you choose — only you do. See Add or change contact pictures.