How can I effectively layer liquor in a cocktail to create visually appealing and delicious drinks?

To effectively layer liquor in a cocktail, use a spoon to pour each ingredient slowly over the back of the spoon into the glass. Start with the heaviest liquor and work your way up to the lightest. This will create distinct layers and a visually appealing drink. Experiment with different colors and flavors to create delicious and visually stunning cocktails.