As a wise man once said... "try... try... and try again... then go post your image on board game geek". Wise words.
Check out the new heroes I've been working on here:
http://www.boardgamegeek.com/article/3668334#3668334
If you click on the images, a larger image will appear that you can use for printing.
Remember the cards should be exactly 3.5 inches wide.
Judd