'Darkening' in the layers

Ohhh, I would so love to see 'Darkening' placed as a option in the layers, It would totally transform my 2D primary radiative images (yellow, red and blue) into a 3D world.
I'm poor as dirt (the 3d stuff was almost cause for divorce!) but I'd offer a contribution of $200 if it could be added to Openbrush.
Image below, Primary Micropointillism (on three colors) Imagine that in 3D!
https://photos.google.com/share/AF1QipPF3Bmbfw3nENyU_5u0Yjzz5SQynnPZ-uUU0jlkMKx0VJfD2VjpOiqzsu9tJRX6dw/photo/AF1QipM0X4W3BSGi5JoAJ1vHDHLc4lOEsn2enrsZaXcB?key=bmp3cEZheHVuZ3YxcDFrN3YxcURkbjNOT3NsaDlR
Google Photos
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