Thread:Blaster Niceshot/@comment-25523075-20150728093517/@comment-17725354-20150728190458

PhilippL wrote: But I like to have my own avatar image for another user also on the user page. Sorry, but I'm not exactly sure what you mean. I think you meant you would only like the avatar to change in the user masthead?

If so, JS Fiddle demo

And as AwesomeOrange pointed out, using this site-wide would break the ToU, so you should only use this script in personal JS.