You can in theory change your single-letter icon to a profile picture, in user preferences.
This should now ACTUALLY WORK cheers cheers. In case it still doesn’t:
Gravatar does work, though you’ll need to create an account there.
In more detail: load https://en.gravatar.com/, “Sign In”, “Create An Account”, use the same email address that’s on your account here, do the email verification thing, end up back at Gravatar, attach an image to your email address.
Then come back here, Preferences, Profile Picture, Gravatar, “refresh” if necessary.