A group of children wearing colorful hats are smiling at the camera.
Some children are getting their picture taken.
Some children are getting their picture taken is a more generic way of saying the same thing.
exists e2 e1 s1 x1 x2 x3 x4 x5.(n_camera(x5) & at(e2,x5) & Actor(e2,x1) & v_smile(e2) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_hat(x4) & a_colorful(s1) & Theme(s1,x4) & (x2 = x3) & n_child(x2) & n_group(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_child(x1))