Retro Cartoon Stickers on Dark Green AI Image Prompt

Three cartoon stickers scattered on a dark green background, in an American retro cartoon style, full of childlike fun and fantasy. The first is an orange mushroom-shaped spaceship with clear spot texture; a mouse is driving at the dashboard, animals operate machinery, and the rocket emits cloud-like smoke with the prominent text "UnderStory". The second is a bus adventure sticker: bottle cap wheels, leaf propeller, an owl holding binoculars, a squirrel using a tablet, each animal playing their role; detailed forest pattern inside the windows, and the text "UnderStory" on the bus strengthening the brand. The third is a letter 'U' shaped forest eco-sticker: the U-shaped tree has fine texture, with tree hollow houses, streams, flowers, and micro-buildings forming a natural scene. The color scheme uses dark green background with bright colors, flat lighting effects distinguished by color blocks, and white outlines around the stickers for decorative feel. The overall composition is lively and compact, conveying a joyful adventure atmosphere of animals exploring nature; details mix mechanical and biological forms, full of childlike whimsy, high quality, high precision.