Decorate eyes and mouth. Prepare buttercream icing following recipe directions. Tint portions black, gray, light and dark green and rose. Reserve remaining white.
Use tip 4 and black icing to pipe outline mouth. Use tip 7 and black icing to pipe outline eyebrows. Use tip 12 and white icing to pipe dot eyes. Pat smooth with finger dipped in cornstarch. Use tip 4 and rose icing to outline lips. Use tip 16 and rose icing to fill in lips with stars.