Rakumaker

Okay what you actually do here is go around to a bunch of different portraits and ask if they know what his password is. I sugest talking to the portrait in the grand staircase whose password is Studious Succsess. Then he'll tell you to go find a picture of a female shepard on the second floor who will tell you to go talk to the portrait in the viaduct entrance by the bookcase. He's going to tell you go talk the portrait of Hufflepuff with the bloodhound.