Make a model first...

Although at the time it feels pointless, I always like to form a clay model because you might discover information about the shapes that could change the outcome of the piece. I used plasticine clay provided by my studio at Buffalo State College, I formed the horn wing and realized when finished my proportions could be cut in half.

This model is probably 6" by 6." This is a chest piece/pendant so the proportions could be cut to half the size, however I think I made the clay model bigger because it is harder to work on details when the size is large. I also realized there are a couple of points in this design, which when working with metal, sharp edges can be dangerous. If time was not a factor, I would have made several clay models to ensure the proper execution of the final copper piece.