Design a 3D model of a masked graffiti artist mid-action, wearing a colorful hoodie splattered with paint, baggy jeans, and scuffed sneakers. The character has a spray can in one hand, with vibrant paint mist in the air, and a backpack full of art supplies. Their face is partially covered by a bandana, and they have headphones around their neck. The backdrop is an urban alley with brick walls covered in graffiti art.