How to hand-paint a rock/cave texture ?

I want to create a tiled texture to texture a cave dungeon. The texture direction is hand-painted, wow like. I've looked for tutorials, but most are about either sculpting the surface or using photo sourced textures and lot of filters.
I've not so much of a problem when the wall consists of single stones or bricks, but I don't know how to approach a rock/cave like texture. Looking at reference photos I only see lot of small details , I'm currently lacking the ability to catch the core features of the rock and to translate this to some painting technique.

Any help will be appreciated :-)


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