A collage of stop-action surfing pictures.
a couple was there
The sentence "a couple was there" does not necessarily follow from the sentence "a collage of stop-action surfing pictures" unless the implication is that a couple was there to see the collage.
exists e1 x1 x2 x3.(a_topic(x1) & of(x1,x2) & n_picture(x2) & Actor(e1,x2) & v_surf(e1) & of(x2,x3) & n_stop-action(x3) & n_collage(x1))
exists s1 x1.(Theme(s1,x1) & a_there(s1) & n_couple(x1))