A couple of years ago I considered getting into Photogrammetry I was pretty serious about it: I build a little light box and a lazy-susan got myself a bunch of lights a half way decent camera and the prohibitively expansive Agisoft-Photoscan which I hear is now called Metashape?! This was my first test object a little rock that I found in my neighborhood next to a construction side If you look closely you can tell its actually a chip from a red brick. I have used this rock at all sorts of scales as little pebbles and as giant cliffs generic rocks are really flexible like that as long as you augment it with some detail textures. I filled in the gabs around the uv shells to make this texture tile-able but I have not yet gotten around to using it in that capacity. Even though I enjoyed this process I was a bit turned off by how many steps there are and how long some of the pre-calculation takes. And now with the rise of Quixel-Megascans there really is no further need to pursue this career avenue. Anything realistic you can pull much faster out of the Quixel archive and anything stylized/fictional you will have to sculpt yourself anyway.