Is this OK: to the left (and at the back) a pic (jpg) of my grandson as opened in AP.
More to the right: the photo opened in Nik Color Efex and an effect applied. At the right you can see that the effect is applied on a duplicate (that I made before starting Nik).
Hope this helps.
As I only want the effect to apply on the skin, and probably less than 100%, I will now add a layer mask to the duplicate layer, invert it (⌘-I) and brush in the effect using a soft white brush.