I just spotted this page from inker Marc Deering, whose work can be seen on the recently-released Demonslayer: Lords of Night #1. He has a few pics of San Diego Comicon doings up on his site, including a shot of the Avatar booth and a couple of a dinner including Avatarians William Christensen, Sean Shaw, John McCrea, and Antony Johnston.
Speaking of, there have been a few other Avatar SDCC pics out there… there’s one of William Christensen on this page at Comic Book Resources, and one of Jacen Burrows at the booth in Steven Grant’s Permanent Damage column.