Ground stomp next to the Lake Kingdom NPC (between the Wooded / Metro NPCs) to find the treasure.
On the ridge near the Odyssey, you’ll find a line-up of characters from all the other kingdoms. Scroll through the pictures to see the hint art location (1), the hint art itself (2), and the treasure location (3) in order. Remember to snap a screenshot for future reference - or check out the complete gallery above. Press when you encounter hint art to take a closer look.
Super Mario Odyssey: All Hidden Portrait Warp Zones Locations | Secrets Guide.Super Mario Odyssey: How To Access 2 Extra, Bonus Kingdoms | Secrets Guide.Super Mario Odyssey: Collect Every Moon & Earn Unlocks | 100% Completion Guide.Super Mario Odyssey: 10 Tips & Tricks To Help You Get Started | Beginner’s Guide.