a guy on street watching someone.
The man is the only person in the picture.
A guy watching someone implies that there is more than one person.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_watch(e1) & n_person(x4) & (x1 = x3) & on(x1,x2) & n_street(x2) & n_guy(x1))
exists p1 x1 x2 x3.(n_picture(x3) & all x4.(n_person(x4) -> (x2 = x4)) & n_person(x2) & n_man(x1) & (x1 = x2) & in(x2,x3))