Sadly, we have had to restrict the use of personal avatars. We do this so that we can control how much bandwidth is used by our site, and also to ensure that appropriate images are used at all times. As this is a family site, we cannot allow the chance that someone puts up images that other people will find offensive.
Please feel free to select from the predefined avatars. If you really want a specific avatar, PM me and I'll see what I can do for you.