Google Search docs basically has a page on preventing your images from appearing in their image results.
Essentially, image uses a separate crawling bot, and you block the image URLs used in your robots.txt file.
User-agent: Googlebot-Image Disallow: /images/hank-the-dog.jpg
I thought this was pretty cool and worth sharing. You could do this for your personal images on your own site! That’s a solid use case.