Portrait Male Shaggy Brown Hair Displaying

Design a portrait of a young male with shaggy brown hair, displaying a bright smile and wearing a plain dark t-shirt. The background should be a soft gradient of light gray to add depth. The subject should be positioned slightly off-center, looking directly at the camera with a friendly, approachable expression. Adjust facial features to include a more angular jawline and a slight dimple on one cheek, while maintaining a youthful appearance.