If APIs are deprecated they may work for now but not with full features and may go offline in near future.
If you go to https://developers.google.com/image-search/
It says its Deprecated and the number of requests are limited now.
Important: The Google Image Search API has been officially deprecated as of May 26, 2011.
It will continue to work as per our deprecation policy, but the number of requests you may make per day may be limited. We encourage you to upgrade to the Custom Search API, which now supports image search.
Here is the link to Custom Search API
https://developers.google.com/custom-search/
Hope it helps