To have your image displayed all the time, I think you have to place your picture as "avatar" instead of posting it as profile picture otherwise it will only be displayed in your user cp.
Regarding your interest in joining The SENTINELS, I'm not so sure if a new user can readily join the group or any group. But anybody in my contact list who support the group's advocacy - help promote the Philippine tourism and travel in the right perspective by providing useful inputs rather than arguing just for the sake of argument- is more than welcome to join and help.