There are many plugins available for GIMP, the registry here being a good place to start. Two filter tools in particular caught my eye and I’ve been having fun playing with them both. Firstly FX_Foundry and secondly G’MIC. Both have a vast number of effects that you can apply to be tweak or completely re-model your images. I attach a twirl below which to me looks like a Fresnel lens effect.
I am currently reading..
The Girl in the Spider's Web - David Lagercrantz
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