Can't change WoW Classic profile picture

For LIVE I’m able to have a picture of my character as seen in the one image but I am unable to have anything other than a blank portrait for Classic logs. The only inconvenience this causes is when discord posts the log from the webhook it shows the profile image in the hook and it honestly just looks funny.

Is there any way to change this?

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No, Blizzard doesn’t have an API for Classic, so there’s no way to get profile pictures.