Capture a cinematic 4k photograph of a turtle exhibiting an expression of speed, as if it is racing swiftly. The image should be highly detailed and shot with a Kodak Portra 800 aesthetic, highlighting the ultra-realistic texture of the turtle's features. Its face should appear illuminated with vibrant energy, set against a dynamic backdrop that enhances its swift movement. The composition should be visually striking, evoking a sense of epic motion and vitality.