I really like the concept and a lot of the execution so far on your deck!
However, there is something I'd like to add. Sometimes less is more. With the court cards, I really like a lot of what you have going on, but the hair/ribbon on the sides of the shields don't work IMO. I think it would look much better removing it. Just with the shield, crown and sword.
I also think the shields look better straight up and down rather than at an angle, and standard alignment of the pips, straight up and down.
You've absolutely nailed the Ace of Spades and the back design.
Whatever you design designs, I wish you the best of the luck with your deck!