You are facing towards a railing, turn left and move forward until you see an opened door on your left, turn left and move forward until you see a couch on your left, turn left and move towards the opening, you are facing towards the portraits, slightly turn right and enter into the room which is infront of you, slightly turn right and move forward, slightly turn to your right and move a bit forward, where to the right you can find cupboards, that would be your end point.