I've added Pinterest to my reverse image search extension [1] to avoid having to sign up when there is no alternative source for the image. It returns Pinterest search results [2], and you can access the image directly from the image icon.

I plan to release the image extraction module in a separate extension, so you can just click on the page area with the image, and it opens the image in a new tab. This way you will not need to do a reverse image search to get to the image, or manually look for it in the page source.

[1] https://github.com/dessant/search-by-image

[2] https://i.imgur.com/L2wv2Wk.png