To be more exact
I edit my Avatar on the Xbox 360, i then take a picture of how i want him to stand, that picture is then set as my Gamer picture, i then go to xbox.com, i log in, i go to My Xbox, then i go to Manage Account, and on the left side, i have my Gamer picture i just took on the 360, and i have a full size image of my character automatically created by Xbox.com, i save both the Gamer picture, and the full size one, the full size one i save just for future purposes