Design a clip art image in a watercolor style showcasing the beauty of autumn, with richly textured leaves in shades of red, orange, and gold, and a rustic wooden bench adorned with subtle watercolor washes. Ensure that the image format is PNG and there is a transparent background style by Lucy Fleming, watercolor, smooth gradients, black contour outline, ultra detailed, clipart elements, delicate pastel colors, solid white background, super clear, high quality