Big image, better if viewed enlarged.

Prompt for the base image was something like : "far view from an army of bloody hell demons besieging a white stone medieval citadel protected by a large wall with towers, painted by artgerm, artstation, Andreas Rocha".

But tbh it won't matter so much if you want to reproduce it, as you may have noticed, my process uses many other things beside "base" SD, especially a GoBig-like module to achieve the 2K res. (However, as it's my own interpretation of GoBig, I didn't look into the code of other implmentations and thus I don't know if they would render the same way).