A new feature is available that many artists have asked for.  It allows you to replace an image on a card with a new image instead of deleting the card and recreating it.  
 
You can now "change image" on existing cards.  This is done through Manage Cards from your Admin Settings page.  You'll see it in the Edit box as "Image: Change Image".  Your card will not need to be re-approved and it will retain all of it's statistics.  
 
Let us know how this works for you.  
 
Mindy