This is all Photoshop. Not that it needs to be, truly any program with decent pen support and brush-engine is all that this work needed.
And there are so many programs with better drawing/painting support that PS.
It’s just one I have and am familiar with.
This is all digital.
I don’t have the space for the kind of setup I like to have for old school analog drawing/painting. Digital is more convenient, easy to put aside when you don’t need it, and so much less dirty. Maybe once summer gest going proper I’ll bust out ink and paper when it’s too hot to sit on a computer.
The tale makes an oblique ref to Bast, one of the Elder Gods.
The Elder Gods evoke awe & reverence in those who espy them, whereas a Great Old One, Outer God et al, cause horror,even madness in one wretched enough to see one.
Chronic exposure leads to physical,mental & spiritual degeneration...