You have to just make the system go where you would think a natural hairline would go. heres a quick example of how some of mine are. What you do is, draw a hairline that you think fits you best or what you are looking to achieve with a makeup pencil or something on your forehead. If you feel like your forehead is too wide horizontally.. Than make temple flaps above the side temple points with an arc angle that would fit a natural hairline. All you really want to do is try and copy what your hairline would be before it receded.