Snowy Owl Cake

This cake has 4 stacked 6" vanilla cakes. It has vanilla buttercream and a layer of homemade marshmallow fondant. The owl is a RKT sculpture covered in fondant. The sticks are wires coverd in fondant. and dotted with buttercream for a little snow effect. The cake has a little airbrushing on it..just started airbrushing so I'm still learning when and how to use it. I've never taken a cake decorating class and would love for you to share any tips that you think might could have made the cake better..especially on the airbrushing. This was a birthday cake for triplet boys celebrating their 13th birthday.