I think "flawless" skin is unattainable.

I think healthy living including eating good foods/balanced diet, enough sleep, drinking enough water, laying off all the facial make-up, not too much sun, and so on will probably do more than any herb or pill you could take.

FataMorgana

Absolutely what Fatamorgana said. You just have to look after what nature dealt you. That said I do find a cream with calendula is good if you've got a sun or windburned face. Doesn't make you flawless, just less sore!