The waiter with a white shirt and black vest is waiting on the people in the restaurant with a big mirror in the wall.
a waiter takes orders
A waiter taking orders doesn't have to be the same waiter in the white shirt and black vest, and the waiter present doesn't imply he is taking orders at that moment.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8.(n_wall(x8) & n_restaurant(x6) & n_people(x5) & n_waiter(x1) & in(e1,x8) & in(e1,x6) & with(x6,x7) & n_mirror(x7) & a_big(s3) & Theme(s3,x7) & on(e1,x5) & Actor(e1,x1) & v_wait(e1) & with(x1,x2) & n_vest(x4) & a_black(s2) & Theme(s2,x4) & n_shirt(x3) & subset_of(x4,x2) & subset_of(x3,x2) & a_white(s1) & Theme(s1,x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_order(x2) & n_waiter(x1))