how can i delete default contact picture? topic

hi

i used an app which i forgot name of it. it changed my contact pictures which i chose inside of app but now i forgot the name of app and my contact's pictures i can't changing. how can i change these absurd pictures to stock pictures back? do u know an app for change these pictures? i don't want to delete these pictures

by the way i think this about my google account cause pictures changing when i sing in my google account

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