For never having used nuke before it's good, it's really not the easiest thing to jump into. I hope working through the entire pipeline has given you a good overview of the process in full and will save you some time on your next project.
I've just downloaded your image and ramped the contrast on it. It's a bit exaggerated but it should show how you can make the image pop a bit more. It makes for a more dramatic image which may or may not be what you looking for. I leave it here as food for thought, and to show a different take on the same image which is better is dependent on the look you're going for. I just leave it as an example of something different.
All the best
Dave
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"