Hello RMisakaMikoto,
Thank you for your response and clarifying your concern. Let us try other solutions if this is fine with you.
Press Windows + R and key in the listed path below and see if you can locate the picture.
%AppData%\Microsoft\Windows\AccountPictures
%ProgramData%\Microsoft\User Account Pictures
C:\Users\Public\Pictures
If that doesn't help, please let me know so I could further help you with your concern.
Hope that helps!