I love the clubs, and that psycho makes a perfect jack ass.
I googled Jack of clubs, and noticed that on other cards the dividing line goes the other way, and cuts out the useless arm just under the shoulder, similar to this maybe?
Edit: I'll edit your card to better illustrate what I mean. Give me one day. I'll see if I can actually make a deadline I set for myself, for once.
As for the back of the cards, I like the blue ones better, so I think it has less to do with style, and is more of an irrational attraction to the colour blue.
The chromatic backs just look wicked and scary. In a good way of course.
In 33 hours I'll start throwing a lot more ideas at you. I should try to write up a mature, sensible proposal, but it's more likely that I'll throw a 500+ word, unedited stream of consciousness at you.
Short version goes something like this. I "pledge" financial support, you take my money, give me the parts of my package that are already done, and I get the rest as it's finished. For example you could give us a play test version of the PDF, and some wallpapers etc, starting at $10-15, and we can download an updated version as it's available.
This way you get your money slower, but it has a better chance of snowballing.
Also remember, you have a larger starting fan base for the next time, if you do go down the KS path again.