Head to the fifth floor of the Grand Staircase and find the portrait that rhymes. He’ll tell you to find the portrait with three faces, which can be found on the seventh floor corridor. The three-faced portrait will tell you to ask Professor Basil Fronsack. To find him, go the third floor and climb the stairs toward the Defense Against The Dark Arts room. Stop at the talking gargoyle and take the passage beside him. Continue until you reach the portrait just before the Charms room. He will tell you to find shepherdess. Now go back the way you came but enter the door on the left just before you reach the stairs to the third floor. Head down the stairs until you find a portrait of a lady in pink with a staff and sheep. She’ll tell you to go see Google Stump. Head to the Viaduct Entrance and speak to the only portrait in the area, next to the bookcase. He will tell you to ask Gifford Abbot. Head all the way down the stairs in the Grand Staircase and find the last portrait just before you get to the entrance. He’ll tell you the password, which is “This password is absurd.” Finally, head back to Pratt’s portrait and talk to him.