card-based avatars new jep also has something that we should adhere
<presence from='juliet@capulet.com/balcony'> <x xmlns='vcard-temp:x:update'><photo>sha1-hash-of-image</photo></x> </presence>
http://www.jabber.org/jeps/jep-0153.html
eg. iChat [who started this idea] don't show our avatars because of that