I hate to pull the race card, but contrary to popular belief race is still a huge factor in our society and for black people primarily functions as an obstacle. We have a black president, but that is an anomaly. Blacks still struggle more than their white counterparts of various ethnicities. Hollywood in particular makes it especially difficult for black and Asian actresses to emerge the way white actresses can. That's why you see Emma Stone, Rooney Mara, and Blake Lively on the covers of Vanity Fair and Vogue long before they've proved their "worth" in the business; meanwhile you've got equally and/or far more talented women like Kerry, Thandie Newton, Joy Bryant, Taraji P. Henson, Yaya Dacosta, even Zoe Saldana has yet to land a Vogue or Vanity Fair cover and she's starred in two extremely popular franchises to Emma and Rooney Mara's one each. Now, people like Anna W. will say that they are only reflecting the climate in Hollywood and they're only giving "the people" what they want. But as boring as both VF and Vogue have become lately with their choices and their content, honestly, they could use some spicing up. They're not interesting anymore, IMO, and it's largely due to the fact that if they aren't blatantly rejecting diversity they're afraid of it.
Sorry for the rant, but I'm pretty sure the reason Kerry hasn't gotten more high profile covers despite being an obvious style "icon" as much as any other Hollywood It Girl, is because diversity is not high on the light of priorities in this particular industry.
Love, love, love, love this look so much. The dress alone is not necessarily my favorite, but she works it somehow. 
