Working process for this -
Doing it retroactively always leaves me with fewer steps than if I snapshot as I go, unfortunately, especially on a piece like this where it ends up all being one layer, so there's always bound to be that 'and now just paint it'
step in these processes.
But anyways, final image ended up at 6500 px high.
Working time was about 7-8 hours, pretty much only using the second of these brushes
, in PS CS4.