Little Mermaid Cake How Do I Transfer A Cake Decoration Smoothly?

How do I transfer a cake decoration smoothly? - little mermaid cake

I want to make a cake and an image transfer to them. I know the basics of how this is done, but I'm beginner in cake decorating, and I wonder if someone could please explain how to smooth this aspect in detail as good as this picture, I'm online.
http://images.search.yahoo.com/images/vi ...

Thanks for the help!