Outline of a selection

[rich2005]

Thanks, that gives a bit more to work on.

Looking at the foreground extracted image, all the dark colour is removed, as with an aggressive colour select.  I would try and find some other method to make the initial selection.

I used regular Gimp here: The foreground selection tool see: https://docs.gimp.org/2.10/en/gimp-tool-...elect.html

Then a layer mask using the generated selection.

There are other ways but this is what I recommend.  3 minutes https://youtu.be/2WB1Yw6XwBU Sorry it is in English.