I remembered the magic island in gallery so I went check there bit disappointing but it made me realized you can meet fawn, made me love how you added that the npc can wander to other spot like Cassie went fishing and hope to see more
The island is the popular painting in the gallery inside upper new ark to enter the painting you have to go to the receptionist from the inside of the gallery (walk behind them) and interact with them (this moves some guards) then go to the room directly to the left of the Island painting and go in the middle of the exhibit in that room then don't pay when they ask you to and when you can move again go back to the Island painting and you can enter the Island!