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The digital artwork, "PA no 2", for "Gems" album jacket has been used by kind permission of Roger Turland (aka krigl), a superb digital artist from Czech.
As I've been a big fan of his beautiful artwork, which mainly consists of fractal and Mandelbulb 3D creation, since 2013, I'm so happy to be able to use his work for "Gems". That's just the icing on the cake.
Please visit his deviantART page and you'll find more marvelous pictures.