The teenage boy and girl are smiling under a red flower.
The teenage couple in formal wear are smiling under a red flower.
Two people smiling together does not mean that they are wearing formal wear.
exists e1 s1 x1 x2 x3 x4 x5.(n_girl(x3) & n_boy(x2) & of(x2,x4) & n_teenage(x4) & subset_of(x3,x1) & subset_of(x2,x1) & under(e1,x5) & n_flower(x5) & a_red(s1) & Theme(s1,x5) & Actor(e1,x1) & v_smile(e1))
exists e1 s1 s2 x1 x2 x3 x4.(n_couple(x1) & of(x1,x2) & n_teenage(x2) & under(e1,x4) & n_flower(x4) & a_red(s2) & Theme(s2,x4) & Actor(e1,x1) & v_smile(e1) & in(x1,x3) & n_wear(x3) & a_formal(s1) & Theme(s1,x3))