Rod wrote:
How did you do the top one PC?

Looks like Swiss cheese or bulls full of holes.
1 on a dup i run Graphic Novel so i got this
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'MIC] Mirrored array ; -gimp_array_mirror 1,0,0,0,0,1.png [ 1.15 MiB | Viewed 1729 times ]
2) make a dup of 1
Color/Invert
Gmic/Circlism
again Color/invert
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Visible#1.png [ 217.76 KiB | Viewed 1729 times ]
3 merge in multiply mode ...but it was too delicate
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Visible#2.png [ 1.01 MiB | Viewed 1729 times ]
But the idea was there so i run the same Graphic Novel preset on the dots

now you should have all ingredients
a play a bit more a bit with layer mode
the top layer was first dot layer i show on top in grain merge mode
below the other dot layer in multiply mode
the Graphic novel bulls
@Rod
now it should make more sense ...i hope!
the last "dot" layer in multiply mode (or burn ? )
on top the first dot layer (the cleaner dots ) in grain merge mode