> Any suggestions ?

Well, first of all you need some reference images. Maybe you have already
studied some photos taken by NASA. This is step one, when you're trying to
get that particular look. What kind of metal was used? Not all metals act as
complete mirrors; some diffuses the light. Some have a distinct texture (due
to irregularities) that helps us identify the material as metal. You don't
need to know the *name* of the metal, but to analyse how much light is
diffused (sometimes that's a lot) and how much texture there is.

Always set ambient to zero - always, in materials that reflects light rather
than emit light. The 'ambient' setting is a feature from old days when
computers were much slower. Have you tried global illumination instead? Even
a fast-rendering radiosity can do wonders to a scene.

Often, a metallic surface gives a blurred reflection. It may also help to
imitate this.

Regards,
Hugo

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