Someone in a lime green shirt is holding on to a tree.
A lady poses for a picture hugging a tree.
Someone does not have to be a lady.  Just because someone is holding a tree it does not mean they pose for a picture.
exists e1 s1 s2 x1 x2 x3.(r_on(e1) & to(e1,x3) & n_tree(x3) & Actor(e1,x1) & v_hold(e1) & in(x1,x2) & n_shirt(x2) & a_green(s2) & Theme(s2,x2) & a_lime(s1) & Theme(s1,x2) & n_person(x1))
exists e2 e1 x1 x2 x3 x4.(for(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_hug(e2) & n_tree(x4) & (x2 = x3) & n_picture(x2) & Actor(e1,x1) & v_pose(e1) & n_lady(x1))