With image search, just as with web search, Google’s goal is to provide the best and most relevant search results to our users.
Following Google’s Webmaster Guidelines and best practices for publishing images can increase the likelihood that your images will be returned in those search results.
In addition, you can also use Google’s image extensions for Sitemaps to give Google additional information about the images on your site’s URLs.
Set HTTP Headers. Some occasional errors when submitting to Google Webmaster Tools.