Find a Grave uses headstones with the name visible. Anything past that is up to the photographer. Its a memorial, biography, headstone photo, living photo and genealogy info. See left for a typical FAG photo.
Slate ran an article calling them 'gravers.'http://www.slate.com/articles/arts/culturebox/2009/10/i_spend_my_free_time_with_dead_people.html
Open this a few times to see random entries.https://secure.findagrave.com/cgi-bin/fg.cgi?page=sh