This violin birthday cake required lot of work! You have to make about two big rectangular cakes and cut out the cake around a violin pattern. This is the size of a full size violin so you also have to think about a good base that will fit the cake.
When doing a cake like this it is very important to have a picture (or a real one) of the violin so that you can work on the details. The more details you can manage the better the result.
Hard work but happy with the end result.