Disclaimer: I only realize now that my comment is about images returned in image search results, not about reverse image search.

Bing definitely uses facial recognition: faces of celebrities are detected, there is a bounding box around the face, and their name and a link to Wikipedia. It does so for clothes as well.

Here is an example (fully automatic):

- the two faces: https://i.imgur.com/bfVNvW6.png

Here is another example, where clothes and items are automatically found in the image, and a bounding box is automatically defined:

- the necklace: https://i.imgur.com/vfhvY0T.jpg - the suit: https://i.imgur.com/AqS3qBV.jpg - the other suit: https://i.imgur.com/jTgRwpb.png

However, for the faces in this second example, I have to draw the box myself:

- the face: https://i.imgur.com/Pe1RLLm.jpg - the other face: https://i.imgur.com/LHOOwnW.jpg

So, what do you mean? What makes Yandex special with respect to facial recognition?