Make hair, eyebrows and beard one day in advance. Tint 1/2 oz. white fondant royal blue. Knead in 1/8 teaspoon of Gum-Tex. Use fondant roller with pink guide rings to roll out 1/16 in. thick. Use knife to cut out random triangle pieces, ranging from 1/2 in. to 2 in. long and 1/4 in. wide at base. Shape two pieces into eyebrows and one into beard. Let pieces dry overnight.
Make sunglasses one day in advance. Tint 1/2 oz. white fondant black. Knead in 1/8 teaspoon of Gum-Tex. Use fondant roller with pink guide rings to roll out 1/16 in. thick. Use wide end of tip 1A to cut two shapes. Use knife to trim off top 1/4. Let pieces dry overnight. Reserve remaining fondant.
Make mini cakes. Prepare batter following recipe directions. Bake and cool mini cakes. Prepare buttercream icing following recipe directions. Use spatula and icing to attach skull halves together.
Glaze mini cakes. Prepare confectioners? sugar glaze icing following recipe directions. Use brush to brush tinted glaze on mini cakes. Let dry 20 minutes. Repeat for a thicker coating if necessary.
Decorate mini cakes. Insert hair into top of mini cakes. Use glaze to attach eyebrows and beard.
For nose, use fondant roller with pink guide rings to roll out reserved black fondant 1/16 in. thick. Use knife and nose cavity in pan as a guide to cut out triangle shape. Use glaze to attach.
Use glaze to attach sunglasses to eye cavities. For rims of sunglasses, roll out remaining black fondant into log, 5 in. long x 3/16 in. dia. Shape around sunglasses and use glaze to attach.