As said before the lighting is great.
Doing photographs like this is indeed a great practice. Is it a practice for some portrait photography? I would love to see a likewise shot from a real couple on their wedding day.
It reminds me of a documentary I saw about Robert Mapplethorpe. He studied lighting in flower studies to practice for his portrait studio work.
His flower shots were distinct for the exploration of curves, shapes and tones (and the harmony between them). I really like how he used that same approach to photograph the human body. You can find quite some of that in his
portfolio on the Robert Mapplethorpe foundation site .