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Very nice indeed!

Good use of space.  Her dress serves as a good lead-in line except that it leads the eye right out of the picture.  That her train gets a bit darker as it gets closer to the frame helps some but not much.  She probably placed her right hand where it made sense to her---her fingers rubbing his elbow.  Her left hand is posed nicely and I wanted to see her right hand also.  I made some adjustments to your image for your consideration.  There is no ultimate right or wrong here.  I am sure the couple liked your image just the way it is.  Good luck.