Combine all ingredients, except the colors and sprinkles and sixlets, into a standing mixer and beat until stiff peaks form.
Add the extra half cup of powder sugar if the royal icing looks like soup
once stiff peaks form split into 3 bowls
add the colors into the bowls, mix until you have your desired color,
place 1 color of icing into 1 piping bag, 3 piping bags, 3 colors
drizzle the icing colors all over the cake
add edible eyes all over the cake
let sit for 10 minutes before enjoying