If you want to change the image icon that you have set while creating the user, you can do it by following the below steps,
- Click on the Apple icon from not he Menu bar,
- Select System Preferences...
- Now hover over your user avatar image icon, you should see edit, click on it,
- You will see a window where you can go to Default section to select other images, or use Camera to click a image, or select from your custom photos collection.
- After selection click on save.
- Your image will be updated.

Edit macOS User Avatar Image Icon

Default Image Options
You can select pretty cool default image options such as flowers, cookie, zen symbol, earth and its elements, music instruments such as drums, guitar, violin, an Owl, Zebra, Parrot or an Penguin.
Note this article demonstrates the steps on macOS Big Sur, the steps should be more or less similar for Catalina and Mojave as well
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