Hey Rick, absolutely stunning designs you have there! Very elegant and intricate. I'm a big fan (:
I agree with most people's opinion on making the King's swirly wirlies less exaggerated for it to be more consistent with the theme and not look out of place while placed together with the queen. I would recommend simply keeping the curl (from the hair) on the left, but removing that ridiculous one (from the beard) on the right. The other smaller curls look fine to me and i believe would look worse if removed. (Have you designed the Jack by the way?)
One 'issue' that bothers me a lot is the flower design on the King's gown. At first glance, I thought they were soccer balls! Of course when examined closer, they are obviously flowers.. But one has to remember the scale of the final product and how the cards might look at arms length. I noticed it straight away and now i can't un-notice it! Haha :p
For some strange reason, i much prefer the flipped queen as shown in your above image. It just floats my boat a little more than the original.. I can't explain why, it just looks more proportionated to me!
As for the colour tint, i much prefer the original. The tinted version obviously has more pop and contrast, but i love the way the original is faded, aged, and thus has more consistency with the overall theme.
Another little suggestion that come into my mind is to advise you to incorporate more of the intricate layer-like texturing design displayed for example on the front of the tuck box. I would love to see more of that kind of texturing on your court card clothing to make them pop a little more and add a bit more complexity/detail without sacrificing elegance. You could even make the textures metallic whilst keeping the base colour normal, creating different levels of detail (the Mana back design is an example of what I'm referring to). I think that would contribute further to the theme of passion and gold. I know i'm not making a lot of sense, it's late here where i live =p.
That's all i have to add for now! I hope you'll consider my suggestions (especially the soccer ball one =p). Your artistic style is amazing and i love your interpretation of this theme.