I have an eBay validation error,

eBay validation error: Buyers love large photos that clearly show the item, so please upload high-resolution photos that are at least 500 pixels on the longest side.

What does this mean? Essentially the image or images supplied do not meet eBay's requirements, which are 

We've got a few simple rules and recommendations for using pictures on eBay: (full article)

All listings* on eBay.com.au and most other eBay sites must meet these requirements
  • Every listing must have at least one photo.

  • Photos need to be at least 500 pixels on the longest side.

  • You can't use a catalogue or stock photo if you're listing an item as 'used'.

To make sure buyers get a good look at the item they're thinking about purchasing
  • Optimise for mobile – make your pictures 1600 pixels on the longest side.

  • Keep your images clean – no text, borders or uncluttered backgrounds.

  • Use watermarks sparingly – make sure they don't distract a buyer's eye from your product.

Other best practice tips:

  • We recommend uploading photos as a .jpg file, but you can upload photos in any of these file formats:

    • JPEG (.jpg file extension)

    • PNG (.png file extension)

    • TIFF (.tif file extension)

    • BMP (.bmp file extension)

    • GIF (.gif file extension)

  • If your photo is in JPEG format, it should have a quality of 90 or higher on the 0-99 JPEG quality scale. We'll then optimise it for display in your listing.

  • Before you start uploading, rename your photo files with names that will help you remember what they are, and put them in a folder on your computer where you can find them quickly and easily in case you need them again.

Visit the Seller Centre to learn more about using great pictures and photo quality recommendations.

For more information on other requirements for sellers and tips on how to meet – and exceed – buyers' expectations, read Selling practices.