When I saw that post on instagram my reaction was, "who is that?" "Is that Ayu???"
It took me a second to recognize her. I don't think anything is "wrong" with the photo. Just that Ayu looks very different here for some reason. Maybe because of lighting, edits, shadows, angles, could be any number of reasons.
Celebrities use things like photoshop and beauty apps to "enhance" their face shape or eyes or skin because of situations like this. They know that every time they are on camera, people will be analyzing every detail of their face, hair, skin, weight, or even their breasts.