生成红包封面，符合以下要求：A serene Japanese garden at sunset, featuring a traditional wooden bridge over a tranquil koi pond, surrounded by vibrant cherry blossom trees in full bloom, with soft pink petals gently falling to the ground, and a lone heron standing gracefully by the water's edge. The scene should have a dreamy, ethereal quality with warm golden light and a slight mist in the air, rendered in ultra-high detail with realistic textures and natural colors.