Create an ultra-cute and colorful kawaii-style illustration that welcomes kids back to school. The scene should feature adorable, oversized-eyed characters: a smiling little girl with pigtails and a little boy with a baseball cap, both wearing vibrant school uniforms. Include a joyful school building in the background, with a flag saying "Welcome Back!" fluttering above. The schoolyard should be lively with cartoonish flowers, cheerful animals like bunnies and puppies, and school supplies like pencils and books scattered playfully around. The image should be bright, cheerful, and inviting, designed to make the return to school exciting and heartwarming for children. --ar 16:9 --niji 6