I really like the sketchy art style of your cards, especially the Joker, Jack, and Queen.
I definitely agree with making the court images bigger. Show off those lines. ~_^
And, listen to Don. He has great advice. ^_^
As someone currently running a Kickstarter project I can vouch for it taking a lot time to get decent estimates, and even more time to do the calculations.
Jamey Stegmaier has some great blog articles about using Kickstarter where you can find a ton of great information about manufacturing, shipping, international fulfillment, and common mistakes, etc. It is mainly focused on board games but the information still mostly applies.
http://stonemaiergames.com/e-newsletter/blog/Good luck with your project!