Spooky tree in foggy woods

I took this today at Hardcastle Crags. The weather forecast was for fog all day so I was hoping for some atmospheric photos of the trees. It wasn't quite as good as I hoped - the fog kept lifting and moving (and not coinciding with me being in the right place). This particular shot worked out well, even though I'd have preferred more fog!

Camera/lens settings: ISO 100, f/3.8, 1/25s, 20mm, tripod.