Cartão Postal Happy duck.

A colorful and incredibly cheerful illustration of a small duck with neon plumage, set against a solid green background. The duck's feathers shimmer with a multitude of hues—from deep blue and purple to bright yellow and orange—giving it a magical, fantastical appearance. The figure has a wide, smiling beak and large, sparkling eyes that exude positive energy. The entire design is rendered in a modern digital art style, characterized by soft tonal transitions and luminous accents.