You can find a mirror infront of you, go near the mirror, slightly turn to your left and move forward, enter into the area which is right side to the staircase, to your right you can find portraits, enter into the room which is to your left, turn back, enter into the room which is infront of you, slightly turn to your left, you can find two stools infront of you, stand in between the two stools, that would be your end point.