Andrey, I’m looking forward to this new feature. One thing I might suggest is using a different icon to remove a face from being suggested. The trash can icon is universal for deleting something, and gives me anxiety every time I use to it remove a face suggestion. It makes me think I’m permanently deleting the photo. Maybe the icon could be the outline of a face with the no symbol. I’m not a user interface designer so just a suggestion.
no symbol: https://en.wikipedia.org/wiki/No_symbol