Need help with adding gloss / specular(?) to sims in render

Hi! I've recently finished a piece of cc and would like to display it on a rendered sim in blender.

I've been rendering sims for quite some time now, but I for some reason cannot figure out how to add gloss to my sim's skin so that it doesn't look so dull. It seems simple, but I can't figure it out.




maybe they're using a specular map, but my specular map doesn't look like that, or do that. Or I could just be doing it wrong.

All help is welcome, thanks!