The last two campaign photos posted really work: the right clothes, the right mood, the right pose and the right model. In the first two photos, I don't think that Karlie elevates the photos and the brand, however she is not bringing it down either, she is just there as a clothes hanger. A more mature model may have elevated things.
It should be noted that the clothes selected are great, and in all of the photos the brand, the collection and the designer are well served because Oscar designs were beautiful.