Decorate cookies. Prepare royal icing following recipe directions. Tint a portion red, tint a small portion dark no-taste red. Reserve a portion white. Use tip 2 and full-strength red icing to outline lips on cookie. Use a cut parchment bag and thinned red icing to fill in. Immediately use a cut parchment bag and thinned white icing to pipe in highlights on top and bottom lip. Let set. Use tip 2 and full-strength dark red icing to pipe a line between lips. Let set.