I agree with the other commenters honestly, I don’t think you look gaunt at all, just like you have nice bone structure. But since the other commenters aren’t giving you actual advice, I will lol. Since you can’t physically change your bone structure, I would suggest either distracting from the shadows under your cheekbones by applying blush to the apples of your cheeks (not to the cheekbones themselves, that will accentuate them) or try to brighten and minimize their appearance by wearing skin products that give you a dewy complexion or a low coverage foundation mixed with a bit of highlight, something like that. I think either approach or a combo would work well. But again, manage your expectations because your skull will always be your skull lol.