Oh I prefer her longer hair, like above! ^ I think longer but still darker would be awesome on Alexa.
That said, I like 2 of the 4 Vogue pics: the second one, in the bra top, is totally sultry; and the last one in the sweater. Really don't like the other two at all, especially don't like the Prada stole one. Doesn't look like Alexa's style to me.
BTW did anyone ever scan/upload the net-a-porter- Spring/Summer catalogue shots of Alexa? They are great!