The picture of Marilyn Monroe uses colour to add effect to the image, Marilyn Monroe herself is in black and white except her lips which are red, the background is also pink. Her lips are red because red is usually there to represent passion and love, but it can also be used to represent danger, this makes the image quite sexual which shows how colour can have a strong effect. The photographer has used a close-up to bring all the attention to the face, the posture of her is quite flirtatious, inviting and provocative. All of this conforms to view of what a woman should look and be like in the 50's, the looks are all about her blonde curls, beauty spot and red lipsticks which was the classic look for women in Hollywood.
http://www.popartuk.com/people/marilyn-monroe/marilyn-looking-over-her-shoulder-fp2009-poster.asp
http://www.popartuk.com/people/marilyn-monroe/marilyn-looking-over-her-shoulder-fp2009-poster.asp