Create a close-up product photograph of a modern smartwatch, showcasing its sleek design and water resistance feature. The smartwatch should have a matte black finish with a vibrant touchscreen display that shows a colorful interface. Set against a light, neutral background, the image should be illuminated with natural light to create a fresh and inviting atmosphere. Emphasize the watch's durable materials and the seamless integration of technology, conveying a sense of innovation and style.