We've found it does work, I feel I know folks better when they use a photo as an avatar.
Yeah but if the person is in scuba gear like mine is how will you know me better? Also since you don't know the people to begin with how do you know the photo is really them?
Like Kamala said, we rely on the honor system. Yes, you can get around the system by using a diving photo or one in which you can't really be seen well. At the time we started this site, this was a groundbreaking concept and we expected some resistance. There's been some, but less than we expected. I'd love to see a change requiring avatars to be clear photos of the person's face. Since I'm no longer part of this site's management team, I won't be proposing such a change.