While it would be great to see an iPhone emoji response directly on an image that an Android user sent to them, a good MVP would be the response at least denoting which image the iPhone user is responding to. If I send three images to someone, and they like one of them, I received [liked an image], but I don't know which one. It would be nice if there was some sort of anchor or text that describes which image the iPhone user liked.
Use case example:
Which if these three paint colors do you like best? Or Which of these Blue dresses should I get?

Many times the iPhone responder Likes the one they vote for, which doesn't correspond to an image, so it's confusing and unhelpful.