The thing about photographing a sunset is not necessarily the actual image of that final glimpse of light in the horizon. It is about the golden light before the actual dousing of the sun and the moments after when the sky turns to a purple hue that paints the world around you. As the sun is moving across the far western horizon look for the opportunities around you that will get you that on particular photo. It may be a portrait, a landscape or even a silhouette that you may capture. Keep shooting and watch the constantly changing colors and exposures. Remember it not over till its over.