Great Question Stepan.
I’ve added both the ‘vote’ and ‘favourite’ objects that match the (account + ‘image_id’ + ‘sub_id’) key to every response from the ‘/images’ routes.
You can see it in action here: https://thecatapi.com/?id=JdMcWHjhB&sub_id=stepan-test
Just Fav/Un-Fav to see the ‘favourite’ little heart icon on the Image added & removed, and Vote Up/ Vote Down, then refresh the page you’ll see the ‘vote’ thumb icon change.
This will work for the ‘/images’ ‘/images/:image_id’ and ‘/images/search’ routes.
Let me know if you need anything else to support your use-case.