The image of the pear is displayed in a low angle in order to increase the height of the character and provide a sense of confusion or insecurity to any reader that identifies with it. Somewhat portrayed as a glaringly obvious insecurity in the eyes of the audience, so anyone that can relate to it is shamed in a sense which in turn elucidates a pressure for women to look like the smaller image of the woman below. This also refers back to how strongly women of this shape stand out in a crowd, similar to how the pear stands out in the ad. There’s also an emphasis on the bottom half of the pear especially, directing the negativity of the body shape on the largeness of the bottom half of a woman.
The image of the woman, on the other hand, is placed in the foreground to imply primal control in the frame therefore creating the narrative that this is the ideal image of what a woman should look like, once again playing in to the unrealistic expectations for women.
The headline is the most obvious part of the advertisement: sending a message and drawing in your attention to the rest of the advertisement. The way the text is formed, “This is no shape for a girl”, is informal in the sense that it is directly speaking to the audience as a person would speak to another which could be implying that it is basic knowledge, not something that requires great amounts of attention or shock as it is something every girl should simply know.