The two people are viewing an artist's piece.
the boy liked cowboys
People are not always a boy.  An artist's piece is not always cowboys.
exists e1 x1 x2 x3.(n_people(x1) & card_eq_2(x1) & Theme(e1,x3) & Actor(e1,x1) & v_view(e1) & n_piece(x3) & of(x3,x2) & n_artist(x2))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_like(e1) & n_cowboy(x2))