Thanks guys, appreciate your feedback and thoughts
I'll see what I can do with the rock. I think I clipped it to black, so I'll try a repro and see how much light I can pull out of it. Now that you mention it, it does look like a cutout.
Roger, I think it was another genuine greenish night. I haven't done much different with the processing. The night before at Cape Arid half the air glow was red, so lots of variation around. I know what you mean by yellow, though. I had 2 nights at Lake Ballard with a sky like that. On the 3rd night the yellow mass cleared away and was replaced by green. Same thing happened at Paynes Find. Very interesting phenomenon.