Ha ha! Like, literally I was thinking just now thinking “I wonder if they ever try to change their default pics…” then I looked up and was like “Oh! Guess so!”
Okay, so I’m assuming this website is linked to wordpress somehow, and the thing about wordpress is that they LOVE Gravatar. Make an account there and set up a wordpress account, you don’t have to pay or make a site, and whatever pic you put on the Gravatar will show here. If that doesn’t make sense just Google “Gravatar”.