I used Adobe Photoshop to transform the women from 'curvy' to 'thin'. In some cases, the difference is hardly noticeable, in other pictures, the transformation is striking. The degree of change in each picture was determined by the limitations of the image. Some angles were easier to manipulate and some backgrounds made it difficult to drastically reduce the figure's size.
The process was largely trial and error. I have some experience in editing images in Photoshop, but I am by no means an expert. In some instances, and shown in the example below, I copied and pasted the external edges of the body.