FWA-Style Textures

RCDeschene

Something I've been meaning to inquire about is, especially with the Merchant Resources from Fred Winkler Art is, how do you get that clean, smooth look on textures like the ones you see on most of his characters? For example, there's the FWSA Skinvent Details Merchant Resource for Genesis 3 Female(s) product which is very detailed with freckles, blotches, and blemishes, then there's characters like FW Frankie HD for Victoria 7 which is very fine, clear, and flawless, while still keeping a realistically superior quality about it.

Obviously, Photoshop is a powerful tool, but what would be a good way to simulate that without compromising the look?