Horsehead, lightened
Warren Keller suggested lightening the image a bit so I gave that a try. I did another histogram stretch and tried to not move the black point too far. If I had left it alone there would be too much 'haze' in the image. Acually the image is still too hazy for my taste but moving the black point any further would drop holes in the image which is bad.
I also did another L masked saturation curve and SCNR to reduce the green cast.