You are facing towards the door right now, slightly turn to your left and move a bit forward, you can find a staircase infront of you, move towards the staircase, turn back and move a bit forward, now you are facing towards the wall, turn right and enter into the room which is infront of you, you can find a closed door infront of you, move towards the closed door, now you are facing towards the portrait, where to the right you can find a couch, that would be your end point.