Change your login picture on Mac
You can change the picture that appears in the login window on your Mac. Your login picture is also displayed as your Apple ID picture and as your My Card in Contacts.
Note: You can’t change the picture for another user that’s currently logged in (indicated by a checkmark on the user’s picture). The user must log in and change their picture or log out so you can change it.
On your Mac, choose Apple menu > System Settings, then click Users & Groups in the sidebar. (You may need to scroll down.)
On the right, click the picture next to your login name, then do any of the following:
Select a Memoji: Click Memoji, then click the Add button to select and compose a facial image. Or select one of the displayed Memoji, then select a pose and style you like.
Select an emoji: Click Emoji, then click the Add button to select an image from the emoji library. Or select one of the displayed emoji and select a style.
Select a monogram: Click Monogram, select a background color, then enter initials.
Take a picture using your Mac camera: Click Camera. Set up your shot, then click the Camera button. You can retake the photo as many times as you need to. See Update your user picture using Photo Booth.
Select a photo from your Photos library: Click Photos. To see photos from a specific album, click the album you want, then select a photo.
Tip: To quickly replace the current picture with an image on your Mac, just drag the image from the Finder onto the current picture.
Select a suggested image: Click Suggestions, then select a picture.
After you select an image, you can adjust its look. Do any of the following:
Adjust the image location: Drag the picture around within the circle.
Zoom in or out: Drag the slider left or right.