Thank Akky
that was a sort of spin off, my starting idea was hack the new kuwahara filter , that has the nice effect but can easily simplify too much the image and so i started to experiment also with edges filters
But if the combination with kuwahara didn't worked as i hoped a more simple combination seems promising
simple as duplicate the layer
run kuwahara with quite soft setting, taking care that all important detail are preserved
on the other dup do the same but with higher values. for a much stronger effect
merge the 2 layer in overlay or soft light mode
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gmic has several other modes that can give nice results here i tried some other
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