纪121邮票的封面设计是什么?

纪121邮票封面设计以简洁明了的风格为主， featuring a single, bold design element. The design is minimalist, with a single image of a bird perched on a branch against a clear blue sky. The bird is depicted in a realistic, yet stylized manner, with a focus on its posture and expression. The overall effect is both elegant and engaging, with the bird serving as a symbol of hope and optimism.