People are taking pictures of something.
There is only one person in the picture.
People indicates more than one person.
exists e1 x1 x2 x3.(of(e1,x3) & n_thing(x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_picture(x2) & n_people(x1))
exists p1 x1 x3.(n_picture(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_person(x2) & card_eq_1(x2) & r_only(x2)))