How can I make icing smooth for my cake decorations?

To make icing smooth for cake decorations, you can start by using a spatula to spread a thin layer of icing over the cake. Then, use a bench scraper or offset spatula to smooth out the icing by gently running it over the surface of the cake. You can also try dipping the spatula or scraper in hot water before smoothing the icing for a more polished finish.