Two people are sitting on furniture and looking at the camera.
Two people are getting their pictures taken.
Looking at a camera doesn't necessarily mean getting your picture taken. They could be taking someone else's picture or even just looking through the pictures on a camera; or even just looking at cameras they want to purchase.
exists e2 e1 x1 x2 x3 x4.(n_camera(x4) & at(e2,x4) & Actor(e2,x3) & v_look(e2) & n_people(x3) & card_eq_2(x3) & on(e1,x2) & n_furniture(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))
exists e2 e1 x1 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_get(e2) & Theme(e1,x3) & v_take(e1) & (x2 = x3) & n_picture(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & card_eq_2(x1))