[Hagar (Doug)]

Hi Bill, A very nice start to your Galaxy collection. The image does look a little on the green side on my monitor but a small tweak on the levels slider will darken the background. A little mor stretching in levels and curves will probably lift the galaxy and darken the background to give a very pleasing result.
Take a copy up to John and ask for his help. He can help you a lot with processing.

Bill Hope you don't mind. I had a little fiddle and just made a change to how the 3 colours were aligned in the histogram and lifted the blue just a touch.