Preventing images from being saved by Google, Bing, and DuckDuckGo as part of Image Search Results is a perfect way to avoid them from being stolen. If you don't want your photos to show up in Image Search Results, you can turn on Cybarmor's search engine locks.
The Search Engine Lock function only works with new images added to your page; it does not prevent search engines from indexing existing images. Photos that have already been indexed in Google and other search engines will not be removed retroactively.
Please see this tutorial to learn how to delete previously indexed files.