Change your Apple Account photo on iCloud.com
Your Apple Account photo appears on your iCloud.com homepage. You can change it at any time.
Go to icloud.com/settings, then sign in to your Apple Account (if necessary).
Tip: If you are already on iCloud.com, you can also tap your Apple Account photo or
in the top right-hand corner of the window, then tap iCloud Settings.Tap Change Apple Account Photo, tap “Browse your device for a new image”, then follow the onscreen instructions.
To change other settings related to your Apple Account, go to the Apple Account website.