Ultra HD 8K vertical A4 panoramic flat Q-version cartoon underwater world long image for children aged 2-5. Overall style: thick lines, rounded shapes, bright but soft colors, safe no-sharp-corner style, large blocks, high contrast, simplified cartoon graphics. Clean and clear composition with distinct object boundaries. Top banner with large title "海底世界 双语认知大发现" in extra-large rounded cartoon font, flanked by mini starfish, small shells, and small bubbles. Main scene: ultra-wide flat cartoon underwater setting with clear foreground and midground, no complex depth of field, resembling a "海底乐园地图". Include 1-2 guide characters (e.g., Q-version diving baby or little dolphin partner) with exaggerated actions to guide the gaze. Core objects: octopus, turtle, shark, dolphin, clownfish, whale, seahorse, crab, etc., all as big-headed Q-version cartoons with thick lines, soft edges, vivid colors, and simple structures. Secondary objects: starfish, shells, jellyfish, coral, small fish, seaweed, beach ball, treasure chest, underwater signpost. Environmental elements: simplified waves, flat coral groups, light-colored seabed sand, shell fragments, bubble trails, Q-version rocks. Add three-line bilingual labels (Chinese, pinyin with tones, English) for all main cognitive objects, using flat rounded rectangles, soft light cream or light blue backgrounds, simple cartoon style, clear bold readable fonts. Use flat cartoon arrows (thick lines, round heads, orange/blue醒目 colors) to connect labels and objects,保持整洁有序. Unified style: flat cute cartoon, bright soft color palette, circular shapes with child-safe edges, clean element separation, simple fun readable composition.