Ways to achieve emphasis

Emphasis by contrast

The use of lighting and the color of her dress on the dark background draw your attention to her. 
Emphasis by contrast: Using light and dark to draw your attention to a focal point. 
"Fashion Photography Focus: Zhang Jingna Aka ZemotionMonoxious | Monoxious."Fashion Photography Focus: Zhang Jingna Aka ZemotionMonoxious | Monoxious. N.p., n.d. Web. 10 Sept. 2012. <http://www.monoxious.com/fashion-photography-focus-zhang-jingna-aka-zemotion/>.

Isolation

The girl in the tan is separated from the three girls in the back, making her the focal point. 
Emphasis by Isolation:  Placing and object by itself in order to make a focal point. 
"The Story Begin: Fashion Photography." The Story Begin: Fashion Photography. N.p., n.d. Web. 10 Sept. 2012. <http://realitywillbesucks.blogspot.com/2011/06/fashion-photography.html>.

Placement

By placing her on the black ring made the girl in the photograph the focal point. 
Emphasis by placement: Where you put an object or design in order to make a focal point. 
"Fashion Photography By Solvay Sundsbo." Big Picture / Photographer's Paradise. N.p., n.d. Web. 10 Sept. 2012. <http://www.bigpicture.in/fashion-photography-by-solvay-sundsbo/>.