Qwant Images is described as 'Search images with Qwant' and is a Image Search Engine in the Online Services category. There are more than 10 alternatives to Qwant Images, not only websites but also apps for a variety of platforms, including Google Chrome, Firefox, Opera and Mac. The best alternative is TinEye. It's not free, so if you're looking for a free alternative, you could try Google Images or Image Search Options. Other great sites and apps similar to Qwant Images are NooBox (Free, Open Source), Search by Image (Free, Open Source), SauceNAO (Free) and Yandex.Images (Free).
Search by Image is a Firefox extension which enables you to initiate a reverse image search from the right-click context menu or the browser toolbar, and comes with support for more than 30 search engines.
SauceNAO is a reverse image search engine. The name 'SauceNAO' is derived from a slang form of "Need to know the source of this Now!" which has found common usage on image boards and other similar sites.