:sunrise_over_mountains: Viewimage

Google removed the "View Image" button on the 15th of February. This is a bookmarklet that allows you to download the full-size photo you're currently viewing.

Tested on Chromium 63 and Firefox 57.

Usage

1. Head over here and drag the bookmarklet to your bookmarks bar.
2. Go to Google Images, click on any image to view it, wait for the preview to finish loading, then click on the bookmarklet. The full-size photo should open on a new tab.
3. Enjoy

Gfycat

Alternative

If you'd like a browser extension or a userscript, @devunt has done just that.