Birthday Picnic, Cute Retro Style 紙コップ

A soft, sweet, and nostalgic illustration design depicting a cheerful birthday celebration outdoors. The illustration features smiling children with party hats, a small cake on a checkered picnic blanket, gifts, and colorful balloons. The top section includes a blank space for adding a name, age, or event details. The balloons are styled as numbers. The overall style is colorful, retro-modern, and warm, perfect for any children's event or age celebration.