Calli is one of the best people I know for painting on cakes so if she is offering to help you then you are nuts not to take her up on her offer. She has done some of the best painted cakes I have ever seen and I know she will stick with you until you get it. Good luck and I cannot wait to see what you come up with. I too would like to give that technique a try one day.
Tampa, Florida facebook.com/pages/curiaussiety-custom-cakes