To my younger self, I would say unless you're literally in danger, ask forgiveness instead of asking permission.
Self-care is the non-negotiable. That's the thing that you have to do. And beauty is the thing that can be the benefit of the self-care. Beauty is not the point. Beauty is just a cute side-effect from self-care.
I want people to fall in love with themselves and to be really proud and full of joy for the space they take up. If someone else appreciates the space you take up, then that's icing on the cake.