Lighting and camera angle/positioning/lens focal length choice make her look too "big" on the top...her face looks wide, and her shoulders look quite robust, due to being so close, with such a short focal length lens. See the distortion of her body's size??? See how hugely wide her shoulders look, compared against her waist and hips? This shot would have looked much nicer had it been shot from farther away: this is a perspective problem that we see quite often when people take these kinds of shots from too short a physical distance, to compensate for lack of a longer focal length lens from a better,longer "portrait distance".