To Remove User Account Picture From Sign-in Screen in Windows 10, We have already used the same trick to replace the default User Account picture in Windows 10.
To resolve this issue, you can set a transparent picture as your user avatar without involving Settings by using the File Explorer. If you manually set a transparent image as your user avatar, Windows 10 still shows a background color. However, it is not possible to remove the user picture image using the built-in options of the OS.
We have already covered how to change the user account picture in Windows 10 and how to restore the default image for your user account. By default, it will be synced across all your devices. If your account is a Microsoft Account, the image you set will be uploaded to Microsoft's servers and used in all their cloud services like OneDrive, Office 365 and so on. Instead of the default image, you can use your favorite wallpaper or your real photo. It is also visible in the Start menu as a tiny round thumbnail.
The user picture will be visible every time you sign in with your Windows 10 account.
