A woman in colorful ethnic clothing paints henna on a person's hand.
A woman is writing a symbol on someone's hand.
Just because the woman is painting henna on a person's hand does not mean that it is a symbol that she is writing.  She could be painting literally anything.
exists s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & on(x1,x6) & n_hand(x6) & of(x6,x5) & n_person(x5) & in(x1,x2) & n_henna(x2) & of(x2,x4) & n_paint(x4) & of(x2,x3) & n_clothing(x3) & a_ethnic(s2) & Theme(s2,x2) & a_colorful(s1) & Theme(s1,x2) & n_woman(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_write(e1) & on(x2,x4) & n_hand(x4) & of(x4,x3) & n_person(x3) & n_symbol(x2) & n_woman(x1))