Ashley Greene wears her medium brown hair in a long hairstyle with side-swept bangs. This color brings your attention to her face. This is what hair color should do instead of diverting your attention away from the face. It is often said that your natural hair color will set off your features the best. If medium brown is your natural color, consider keeping it!
I am getting my hair cut when my sister comes... Maybe something like this.... with a lot of volume on top with a thick weight line around the perimeter and long side swept bangs and tapers around the face