Obviously the choice is yours and if you want to go for something that doesn't appear in nature, then thats what you should do.
We're just saying that there are better ways to lower your hairline and get it to blend in with your temple hair than a dead straight line which will widen the appearance of your forehead.

I've done an illustration to show you what your hairline (as per your template) would look like and under it what a difference some modification makes.