Roll out fondant 1/16 in. thick. Use cutter to cut 10 leaf shapes. Place leaves on thin shaping foam; score veins with veining tool. Let leaves dry in various positions on cornstarch-dusted wave flower former. Reposition leaves after 3 or 4 hours. Let dry overnight.
Airbrush leaves 1 day in advance.
Apply yellow, then touches of red airbrush color following set instructions. Apply brown in vein area. Let set, about 10 minutes. Turn over leaves and repeat. Let dry overnight.
Make layered cake.
Bake and cool two 8 in. cake layers. Fill and stack cakes on cake plate for a 2-layer cake, 5 in. high.
Spatula ice cake with cream cheese icing. Use edge of spatula to create lines on sides and a spiral on cake top.
Use dots of icing to attach leaves to cake sides in various positions.