Create a premium 9:16 Google Play screenshot showing a modern white bookshelf displaying dozens of adorable coloring pages including kittens, puppies, dinosaurs, unicorns, butterflies, rockets, cakes, cars, sea animals, princesses, and robots. Some pages are line art while others are beautifully colored. Arrange everything neatly with soft shadows and premium children's illustration quality. Place the headline "500+ Coloring Pages" inside a colorful rounded banner at the top using large playful typography. Bright, cheerful, highly organized, and visually exciting.