in red

i am not normally a fan of the colour pop B&W, but on this occasion it works, i think its the symbolism of the red dress and the flash of stocking top that makes this a little more erotic in nature and hence the red of the dress works. If you look at the psychology of the colour red it is most often associated with heat, passion, sex

I'm personally not a very big fan of selective color, save in very specific instances, because it seems that the technique rather than the message, becomes the point of focus. I think controlling your palette would have had a stronger effect. That being said, it's only my opinion.