People are standing watching something and taking pictures.
People are observing something interesting and sending photos to friends.
Not all pictures taken are sent to friends and observing something does not necessarily mean the the person observing finds it interesting.
exists e2 e3 e1 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 e2 e1 s1 x1 x2 x3 x4 x5 x6.(to(e2,x6) & n_friend(x6) & Theme(e2,x5) & Actor(e2,x4) & v_send(e2) & n_photo(x5) & n_people(x4) & Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & Theme(s1,x3) & a_interesting(s1) & (x2 = x3) & n_thing(x2) & n_people(x1))