Hi.
You have heard of Topaz Bloom haven’t you and it’s Realism feature for doing just that plus Hair, Fabrics and Upscaling all at the same time.
The only caveat to this is Topaz does say it’s for CGI images only but, if you have plastic looking portraits as you say it can currently add back imperfections within photographs and graphics
Bloom: Realism
Instantly remove the artificial feel of AI-generated images with this new, advanced creative upscaler. Skin, fabrics, metal, plastic, hair, and everything in between. See AI faces completely transformed into real people.
Here’s the link so, you can check it out yourself plus other resent updates
It’s the Topaz Magic with a little touch of Rock ‘n’ Roll
Hope this helps