This is a picture I took a few years ago and one I keep returning to and use for testing in darktable. It’s high dynamic range, has some clipped highlights and deep blacks, and I’ve never quite been able to get it as I’d like.
I’m looking for a monochrome treatment (there aren’t really any colours of note anyway) and decent handling of the highlights, but with good definition in the brickwork and the shadows.
The main thing I’ve had issues with is the extreme contrast on the right-hand-side.
My attempt in darktable 3.4.1…
This file is licensed Creative Commons, By-Attribution, Share-Alike.