I never have understood that dewy look. I prefer the look of skin with a satin finish. Dewy usually looks too damp, moist and sweaty, then the highlighter makes it all look like an oil slick. I do not find it attractive at all.
Besides that, after a certain age, skin isn't dewy and it can't be faked.
"Cats are poetry in motion. Dogs are gibberish in neutral." -Garfield