At the risk of sounding like Dave, might I offer a mono option Sue? I have had a quick go at one and think it has a bit more impact. I adjusted the channels in three different layers, the sky, the mountains and the foreground. It isn't perfect and I had to be careful with the sky as it was a bit pixellated so going too dark brought out noise but it gives you an idea of how it might look. See what you think, I won't be in the slightest offended if you don't like it
Cheers,
Rob