Decorate tail. Use tip 3 and full-strength red icing to outline
three heart cookies. Let set. Use tip 3 and thinned yellow icing to fill in heart. Let set.
Brush edge of cookie with damp brush. Position cookie on parchment paper and sprinkle edge with red sugar. Brush off excess sugar.
Use tip 3 and full-strength orange icing to pipe a smaller heart; cover with orange sugar and brush off excess. Use tip 3 and full-strength yellow icing to pipe heart in center of cookie; cover with yellow sugar and brush off excess.