Instructions
Travel to the city of Bog Easy.
Speak to Gilbert the ghost. If you help Gilbert scare the locals, he will open the city gate for you. Complete the quest and enter the town.
Travel toward the back of the town and take the path leading to Lonesome Manor. Once you arrive, the Mad Doctor locks you out of the manor.
Use your paintbrush on the columns outside of the manor. Climb up the columns to the ledge above the first floor door. Walk right to pick up the Anvil Sketch.