Hi Donald,
Currently there isn't a button in the Cart's UI to delete an uploaded Product Image but I have added this to our Dev Raodmap to be added in a future release. As a temporary solution, you have the following options to remove a main product image from a product:
- Export your Product data, remove the filename from the Product then import the Product data back into the Cart. The following Import KB article should help: http://helpdesk.smith-consulting.com/...
- Delete the filename from the Product in the Smith_Products table of your database.
- Upload a new default image.
Hope this helps!