Google uses both schema.org markup and og:image meta tag for thumbnails in Google Search and Discover

Google clarified this within its Google image best practices and Google Discover documentation.

Google Clarifies How It Picks Thumbnails For Search, Discover

Google updated its Image SEO and Discover documentation to explain how schema markup and the og:image meta tag influence ...
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How to a reverse image search on Google

Reverse image search helps you find the origin of a photo and similar photos. While many services offer reverse image search, using Google Search is relatively straightforward and built into the ...

Google Search Wider Images For Some Travel Queries

Google Search may have rolled out an update for the images it shows in the search results All tab. For some queries, Google ...