eBay requires at least one photo to have an item listed on their storefront. To add an image to your listing, navigate to Listings-->Queued Listings-->Product Details-->Image Tab. Click the Green "Add Photos" button. 

Remember to have your photos met the eBay photo requirements. Here are their photo requirements: 

• Photo must be at least 500 pixels for the longest side
• Borders are not allowed 
• No text or artwork (such as “free shipping” or seller logos) may be added to photos. Anything essential to your listing should be placed in the title, subtitle, or item description.
• Photo MUST be in .jpg or .jpeg format, not .png
• Your listing photos will be automatically enabled with a free zoom/enlarge feature on the view item page if they are high enough resolution. If you want to your photos to be enabled with the free zoom/enlarge feature, the photos should be between 800-1600 pixels on the longest side (height or width). Images less than 800 pixels on the longest side will not have this feature enabled.