Right now you're standing on the staircase facing towards the portrait. Turn around and walk all the way up through the staircase. Here you can see two couches in front of you. Move forward, slightly turn right and move forward till you reach a brown table in front of you. Slightly turn right and you can see an opened door in front of you. Walk towards that opened door and turn around. Now exit the room. Slightly turn towards your right and you can see a couch, move towards the couch and stand in front of the closed door and that is the end point.