You can add more than one image for a product. In addition, you can also decide whether the image is visible on the user site or not.
1. Click on the Secondary Images tab on the Product (Update) page.
2. Under the Upload a New Secondary Image(s) section, use the Browse button to locate the image you would like to upload for the product.
3. Uncheck the Is this image visible on the user site box if you want to hide the image on the user site.
4. When you are ready, click on the Save changes button.