I took that reference photo maybe 15 years ago and have puzzled ever since about how to paint it!
Yesterday I picked up a black drawing pen and began to sketch in the tortured trunks and branches, then I washed in watercolour and voila! Finally I managed to paint the scene as it had felt to me all those years ago.
Sometimes as an artist you need to reach for a new tool to express yourself in a different way from how you usually paint. I'm looking at trees with renewed inspiration...