I don't have an avatar set, and I don't have interest in defaults like Brad Pitt and other celebrity class figures. Furthermore, there's sharing your own images, like movies and memorabilia. How is it done?
You need your own photo hosting account (like ImageShack), or some other place you can post photos (like Facebook) and link to. Then you copy the photo's URL (usually ends in .jpg) and paste it into your message using the Forums Code [img].