Modeling chocolate is very forgiving. You can work on the same project for days instead of minutes, and if you add another piece to the project, the “seams” can be made invisible, as the heat of your hands melts the chocolate surface just enough. Modeling Chocolate is my friend. When I made “The Lady”, I worked for days to get her just right. I could not have done that with either fondant or gum paste.
Another big advantage is that the customer can keep a figure that has been sculpted from modeling chocolate for a room decoration… and sometimes for quite some time (though I would not eat a modeling chocolate figure that has been gathering dust on the shelf for the last year).