Design Principles Research: Subject Unity (Second try, with a better image.)

Ad by VSA Partners, Chicago, Lürzer's Archive February 2017, Pg. 37

I think that this ad shows unity in the color scheme and in the similarity of the models in the ad. The women are even dressed similarly to one another. Their dresses are pastel and so is the background in the photo. The product and the logo are not in pastel colors, but are united in bold colors.