If you wish to use a different profile picture than the one you picked when joining the game, you can create a gravatar account at http://www.gravatar.com/ . VDR will support profile pictures loaded from gravatar. Your email account MUST be the same as your VDR account for the picture to show up.
Please also see our in-depth instructions and profile picture troubleshooting in our LEARN section:
Customizing Your VDR Profile Picture