Well if you are coming from a a traditional shopping cart background then you will be surprised to know that Drupal Ecommorce doesn’t allow you to add/upload images easily.
Don’t be disappointed, there is a way..
Step 1: Install Image Module
Enable it from Admnister->Site building -> Modules
Step 2: Add an Image
From Create content create an image as you do for pages etc.
In the title add the product name.
In Body write the product description
Fillup/check/uncehck the option you require
Step 3: This is the key..
In the Product section Select a product type, e.g. Shippable Product and click Add to store
This step will convert (rather promote and image to become a product or whatever you wish to say) an image into a prdocut.
This was simple wasn’t it?