By shiny skin, I’m assuming you mean a bright, radiant, healthy look. I would say the most important steps to ensure this, is to make sure that you are cleansing and exfoliating properly to ensure a healthy cell turn-over and ensuring that you don’t have dull dead skin cells sitting on the surface of your skin. It is also very important to ensure you are keeping your skin thoroughly hydrated with a good hydrating serum or active moisturiser. Also, ensure that any skin conditions present on your skin are treated with an active serum. Lastly, always ensure that you applying a good, effective sunblock on a daily basis (twice a day if possible).