Neckline And Hair For A Long Face

I am very troubled on what neckline for my wedding dress will be. I have a long face and a long chin. My coutourier designed an assymetrical neckline for me. That means a strapless gown with the left side of the neckline a little over than the right making it appear that its somewhat diagonal. I really have no idea if its ok for me. And please help me on how i should wear my hair. Please help me on this!