Prepare cake mix according to directions. Use pan grease and brush to reach tiny crevices of mold and prevent sticking. Bake. Allow cake to cool. Spread generous amount of buttercream on middle side of one cake and press against other side. Spread buttercream on cake board and carefully stand cake up, pressing into buttercream on the board.
Mix buttercream into desired colors. Use a small offset spatula to ice snowman white. Carefully place spatula against icing and pull away to form a spackled look, repeat this process over entire white area. Use the spatula to carefully smooth black buttercream on for the hat. Use a #47 tip to pipe a line for brim of hat. Also use the black with #2 to pipe mouth and eyes. Use a #2 tip to pipe green holly leaves and a #6 to pipe red berries. Use a brown #4 tip to pipe long lines to create the broom and bristles. Thin down with water, just a little, red and blue icing for the scarf and carefully apply with spatula or paintbrush. Use #8 to pipe orange nose. Sprinkle coconut on ground to look like snow.