A young girl painting a picture.
A young girl is painting a picture of a horse.
A picture can be of anything not particularly a horse.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_paint(e1) & n_picture(x3) & (x1 = x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_paint(e1) & of(x2,x3) & n_horse(x3) & n_picture(x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))