I think there's more than one way to have prominent cheekbones. I have them, and they run in my family, who retain them in their very old age.
But what can slip are (I think) the buccal cheek pads? It's a fatty, cushiony part of the cheek. Those can be pulled up. If they are/always were thin, that part of the face can be padded somehow to give the illusion of youth. Whatever they put in Joan's face seems to have a pointy bit or something--that angular look is not so youthful or natural. Rounder would be better. Round shapes generally = youthfulness.
I think Joan looks okay, though. The eyework is a little overdone, and her veneers are too white for my liking. With her coloring, hair, and overall style, the effect is a little harsh. But it's not that bad. Her jawline and neck look really good; that part someone got right, I think.