At the top of the FAA or Pixels site, in the menu to the right, is a drop down when logged in.
PROFILE page takes you to all your art as you have set it up
BEHIND THE SCENES is the administration area where all the tools are to set up the site.
At this time you are looking for your PROFILE PICTURE
On the premium sites, go to the homepage when logged in
At the bottom of that page is the EDIT HEADSHOT tab in the bottom menu