The concepts of Moral Foundations don't come through very clearly, but it's hard to say considering I've only seen a few of the cards so far. Of what little I have seen, I'd say you have some nice artwork that could find an audience, but I think your monochrome presentation is doing it a bit of a disservice.
Perhaps you want to do something different than what other people are offering and that's fine, but presenting nice art like this as just line work makes the cards far less interesting. Some designs are better with a monochrome look but I don't think this is one of them. At the least consider something similar to what you find on traditional cards - a limited color palette, usually three or four colors done as solids.
I feel that more color would make the court cards really eye-catching and help sell the design as a whole, even if your audience doesn't get the Moral Foundations concepts you're trying to get across. It's extremely difficult to convey abstract concepts like sanctity, fairness, etc. within the confines of a court card's two-headed portrait. I'm not saying don't try - by all means, strive on - but don't be too disappointed if people don't get it without a legend card to provide an explanation. You could perhaps try (and for all I know, you already are trying) to present different cultural garb and appearance for each suit as a way of helping to convey different cultures and their varying values. In the end, if you make something that's beautiful and well-executed, people will tend to flock to it in larger numbers.