1. A non-transitory computer-readable storage medium having computer-executable instructions stored thereon that, when executed by a computer, cause the computer to: periodically crawl websites of product manufacturers to locate product images; index the located product images in an image index by keywords extracted from the websites; receive from a seller item details regarding an item; determine whether the item details include image data specifying one or more images for the item; upon determining that item details do not include the image data, search the image index by one or more identifying attributes for the item from the item details to locate product images related to the item; and present one or more product images related to the item from the image index to the seller as suggested images for the item.