After you change your Windows 10 account image to slightly more personality, the last three images are saved as thumbnails in the Settings app. So remove those old thumbnails when you're tired of seeing them.
If you change your account image through Settings> User Accounts> Your Info, Windows displays thumbnails of the last three images to save each account image you've ever used. If you change your account image, there may be some that you want to get rid of.
Unfortunately, it is not so easy to get rid of them, than to right-click on the old image or press the Delete key, but there is a way to get rid of them if you want , Open File Explorer by pressing Win + E, and add the following path to the address bar by changing the "
AppData Roaming Microsoft Windows AccountPictures
Find all the account images you've added to your account using the Settings app.
Select all the images you no longer need Press the Delete key to move them to the trash.
After you delete the images, they are deleted from your user history in the Settings app. If you have not deleted all the old account images from this folder, Windows displays thumbnails for the most recent images that still exist.
That's all! It is not difficult to delete these old user account images. You just have to know where to look!