After more work: scan it!
Scanning gives me more control and higher resolution than a photo, but… my scanner is limited to 12″ x 17″. This piece is 18″ x 24″. So multiple scans, and much care with exact alignment is required. Even so, I have settled for 3, rather than the 6 scans required for the full image. I need some overlap for accurate alignment and matching light.
I like the version above better. For me, the difference (a much lighter grey background at top left, plus more lights in the red-brown twig) makes the whole piece more buoyant, more lively, more magical and mysterious…