Origin of my profile picture

[yadonon]

Hi everyone,

Sorry for coming with such a silly question and not directly about github, but where are profile picture for new user picked from? I got that picture automatically, it also appears when I send an email to someone, as my icon. I've try to change it but damn, I can't seems to find out where it comes from. I tried my google, microsoft, mail account. Nothing seems to do!!

Would be great if someone can finally solve the mystery for me!
Cheers
Y