I'm of the opinion headstock shape is crucial. It can really let down a good looking guitar to have a rushed, misshapen headstock. DB and Wokka are on the money, cut it out in paper or card and look at it from different angles over a few days, you will notice what you like and don't like and where you need to change. As with everything, don't rush it and you will be much more satisfied with the end result.

Oh and if you end up wanting a traditional fender shape, there are PDFs available in another thread that make it easy