A highly detailed, super-realistic image of a single sunflower against a transparent background. The sunflower features vibrant yellow petals arranged in a spiral pattern around a dark brown center. Each petal showcases intricate texturing and subtle variations in color, capturing the natural beauty of the flower. The center of the sunflower is densely packed with tiny disc florets, each carefully rendered with realistic detail. The stem is sturdy and green, with broad leaves extending from it. The leaves have visible veins and serrated edges, adding to the authenticity of the image.