Very attentive poses, plenty sharp and interesting color palette. I would go tighter on the crop, still keeping them centered, which seems to work well in vertical and with their opposing stance. Of course, that would just my personal preference.
Michael,
Adding a little warmth made it much better. It is sharp and can be mistaken as plastic cutouts. The repost added lot of life to it. I am intrigued by the blue shadow. I like the pose. Both of them are covered despite the f4 aperture. You did well with catching them in that pose.