I was only seeking an opinion on the back as it's really the main artwork. I figured I would share it as I create it, but if that's not a popular thing in the playing card community, I'll wait until I'm finished. Thanks for the feedback.
It's not that it's not popular - for any custom deck, regardless of the degree to which it is customized, the backs are usually the most unique part of the design. But it's a little like asking me to look at your brand new car by showing me the keys, one of the wheels, the cigarette lighter and the right passenger door. It's not complete as a deck design. Another analogy would be like showing me a painting you've "made" while it's still in the sketch-on-canvas stage or asking if I like your book you're writing when I'm only seeing three random chapters out of thirty-five or reviewing a movie based on the poster and the trailer alone. Maybe you'll make custom courts - or not. Maybe you'll make custom pips, use a unique color scheme, make indices in a unique size - but we don't know. All these things and many others factor into a design, making it appealing to some and perhaps less so to others.
What little you're showing is nice, but it's not enough to evaluate a deck design from. Find a hundred people who like this, then show them the finished deck, regardless of what style choices you make, and some percentage of those who liked the back will be in some way dissatisfied with the end result because they will have a different idea as to what they like in a deck than the others. So offering evaluations of just the one detail won't help you as much as you might think.