How to Change/Delete Your Account Picture in Windows 10
The default user account picture images are in the hidden system folder below.
%ProgramData%\Microsoft\User Account Pictures
Your current user account picture is stored in the hidden folder below.
C:\Users\Public\Public Account Pictures\S-1-5-21…….(GUID for user account)</color>
Your recent user account pictures are stored in the hidden folder below.
%AppData%\Microsoft\Windows\AccountPictures</color>