The colored linework is interesting, but it's a bit much - perhaps if you limited the number of colors on a given suit's cards to a primary, a complementary and a contrasting color it might look cleaner and easier on the eyes.
While I understand the desire to do something unique and original, go a little easier on those pips! They're practically alien compared to the International Standard. I might vary it up a little, but not to such an extreme.
It's entirely possible to make a deck of cards by hand. Check out this page:
http://whiteknucklecards.com/expose.html An Australian designer spent two years making this deck, completely hand drawn - and it damn near cost him his sanity! He stuck to a simple color scheme for the pips in each suit, giving them a primary color in the background and secondary colors in the Celtic-esque linework in the pips. But here's where the crazy comes in - every single card in any given suit has a unique linework pattern from the rest of the cards in that suit, adding up to FIFTY-TWO UNIQUE PIP DESIGNS. He put an INSANE amount of work into it and it's still one of my favorite decks - a collector's item these days, long sold out. Three versions were released: a red-backed version with a "primitive-style" title typeface, a second release of the red with a more modern-looking title typeface and a blue-backed deck to match release 2.
Get a hold of one if you can. I think you'll find it inspiring and it will send your work in new directions. You don't have to go to the same level of extreme that this designer did, but you can make something by hand, an improvement over what you have at present.
Best of luck!