Google has removed the View Image button and the Search by Image feature when viewing an individual image within Google Image Search. Google announced this change on Twitter,
Today we’re launching some changes on Google Images to help connect users and useful websites. This will include removing the View Image button. The Visit button remains, so users can see images in the context of the webpages they’re on.
The Search by Image button is also being removed. Reverse image search *still works* through the way most people use it, from the search bar of Google Images.
This seems to be in direct response to the concession Google made with GETTY IMAGES FEW DAYS AGO around helping reduce copyright infringement through the popular search engine