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Unfortunately I have no clue of real math, I was, however, very interested in perspective drawing since my childhood. Since the early nineties I'm using 3D-software to create references to many of my paintings as well as this piece. I will be posting some details about the 3D-concepts for my paintings soon.

That is a really good idea for perspective drawing/painting. This is fabulous insight Gric! I am fairly decent at 3D in Blender but I was never happy with the way things turn out in Blender or the time it takes to get it right, I was always more happy with my 2D art. So you are giving me some ideas in my head too because I never thought of using 3D as a reference like this. Thank you for the inspiration.