All you need to do to share your amazing NXE Avatar with the rest of the world is take the URL "http://avatar.xboxlive.com/avatar/GAMERTAG/avatar-body.png", and replace GAMERTAG with...well, your gamertag.
Finally, Copy and paste it in. simple, no?
The website may take awhile to load, and on some ocasions its "sever to busy" if this happens just close it down, load it up and try again.
here's mine to start you off:
It looks fairly close to me