I can't say anything about the composition of these because I haven't got a clue if any rules apply. It would be great if someone, more in the know, could help in that area. I'd love to know.

Your lighting is superb and I love the black bg against the shoes.
The word air is very dominant which is perfect. Nothing else distracts even though the overall clarity is fantastic.
Great POV. I love both shots but if I had to choose a favourite it would be the bottom one because I can see more of the shoe.