autumn treasure hunt poster, 3D isometric perspective, warm golden-orange palette, maple trees with falling leaves, meandering river with wooden rafts, campfire spots and lanterns along banks, chibi-style explorers canoeing, whimsical mushroom clusters, gradient amber sunset sky, dappled forest lighting, tall vertical layout, navigation symbols (treasure map/binoculars), RPG-style quest tracker, cozy campfire glow, semi-flat layered design, Behance featured style --ar 9:16 --v 6
