Everything else works except for Google image search, which is arguably one of the more useful ones.

No longer working on Google

makes reverse image searching very convenient
best used for artworks as most of the services on it are art-related

Yandex reverse search seems to result in an error when searching materials from tumblr now. They work perfectly if I upload it manually, but not when I supply a tumblr link.

Try this tumblr link for troubleshooting purposes: https://64.media.tumblr.com/b034de2ecd5003fc3113fabb23c15668/9b3c7b7f4d187fce-90/s500x750/b0fa687ddba92830cde4dddd2b10f1c57c689979.gif

Must have for any art lover

does not work. just redirects to the url of the searched image

Loving it