You can choose to add pictures to the description of your product. Maybe you want to display your product from a number of different angles, list a t-shirt and want to show the front/back, or simply want to add images in general.
You would need get a URL of your image. One company we use is called Imgur.com. Accounts are free and you simply set one up. You can upload as many images to that site as you want and then request direct image URL.
You can then add that image URL to your descrition and it will show up in the body. You can add as many images as you would like.
Please see the walkthrough below: