As the body changes position then so does the breast. It is positioned over the pectoral muscle and so with every movement of the arms and upper body the breast position slightly changes on the body. Below are a selection of sketches showing the breast position in relation to the body.
In the sketch of the model bending back you can see that as the body bends backwards the breast position changes as it is drawn up by the muscles of the chest and shoulders. Note also that the stomach flattens and the rib cage becomes more prominent.
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