Coco Gauff, teenage tennis player, beach volleyball scene, blonde hair, athletic physique, bright smile, golden tan, shiny sunscreen, colorful swimsuit, American flag print, ruffled bikini bottom, tie-up top, beachy waves, tropical palm trees, sunny sky, warm sandy beach, shallow water, playful splashing, joyful laughing, sporty action pose, dynamic composition, vibrant colors, high-contrast lighting.