Google has started showing AMP results in their image search results on mobile devices. So now if a user uses their Google image search on his/her mobile device, then he/she may come across some images showing an AMP logo and after clicking on the title of the image, they can use the AMP version of the page.
You can see the screen shot showing the AMP logo in the image search results below:
In the screen shot shown above if you click on the result title, it will take you to the AMP version of the Pinterest site.
Here is a screen shot of another site showing AMP in the mobile Google image search results:
Google launched AMP in the top stories in February and after few months launched it in the core mobile results in August.