People are standing watching something and taking pictures.
People are observing something.
Watching something is observing something.
exists e3 e1 e2 x1 x2 x3.(for(e1,e3) & Theme(e3,x3) & Actor(e3,x1) & v_take(e3) & n_picture(x3) & for(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_watch(e2) & n_thing(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & n_thing(x2) & n_people(x1))