How do I get my image into first place?
Image captions are considered in image ranking. The better the image description matches the user's query, the more likely it is that the image is shown on the first page of search results.
The quality of the site where the image is placed, as well as the quality of the image itself, also affect ranking. For more information on what makes a high-quality site, go to Tips for webmasters in the Yandex.Webmaster Help.
Each image in the search results has a link to the page whose description of the image best corresponds to the user's query.