Important images which appear on pages should be declared within the XML sitemap using the following syntax. Insignificant images such as icons, website logos, and other non-unique images should generally be excluded from the XML sitemap.
<image:image> <image:loc>http://example.com/waterfall.jpg</image:loc> <image:caption>Waterfall in Niagara</image:caption> </image:image>
|image:loc (required)||The URL of the image. If this is on a different domain to the site (i.e. a CDN), both sites must be verified in the same Webmaster Tools / Search Console accounts.|
|image:title||The plain-text title of the image.|
|image:caption||A short caption for the image.|
|image:geo_location||The geographic location of the image, i.e. London, United Kingdom.|
|image:license||A URL to a page containing valid license data.|