When you see the current profile picture window, drag the picture you want to set into the round section where the current profile pic is displayed. You can also select pictures from iCloud, Faces (iPhoto), or click a picture right now with the Camera option.
How to change a user’s login picture on Mac If you’re new to Mac and want to set or change your user profile picture, here’s how to do that. Some skip this part (because it’s optional and you can change it later).
Many people usually pick one of the default pictures that macOS provides. Your Mac lets you set a profile picture when you configure it for the first time. It’s mostly a cosmetic feature, but it helps people personalize their macOS.
You have profile pics not just on Facebook and Whatsapp but also on your Mac account. Profile pictures rule the roost everywhere.