You’ll need about two tablespoons for black frosting, two tablespoons for white frosting, ¼ cup for pink frosting and then the rest will be for grey frosting.
Color the frostings then place each color in its own tipless icing bag. Cut openings in the tips of the icing bags: about 1/2 an inch wide for the pink, grey and white frosting bag tips.
Cut a very small opening in the tip of the black frosting bag. The black frosting will be used for fine details so make sure that this opening is very small.