Attached Link: http://www.renderosity.com/viewed.ez?galleryid=36348&Start=19&Artist=Allen9&ByArtist=Yes

You need to select your marble or whatever material, then in the Material Editor, bring up the values for "reflection" and "Specularity". Those are the two that control how shiny surfaces look. Check out my "Temple of the Moon - Sanctuary" picture (link). The whole place is various types of polished marble (27 hour render, BTW, because reflection - like transparency, eats up the time and makes for long renders).