B&W images of sunsets require atmosphere, such as clouds, storms, bursts/shafts of light or contextual/complimentary subject inclusions. It is no good at all for straight on sunsets that could otherwise be exploited to their full potential in colour, particularly E6 film.

Only two of the B&W sunset posts preceding this actually provoke a response in me (top left, bottom right). The other two are too pedestrian.

Try sunsets in color on different formats, at different EI ratings and viewpoints. It is useful to thoroughly scout a location beforehand to exclude people, footprints, fences and flags.