Originally posted by Robin CB Thanks fizzio. That's the sort of "pop" I was trying to achieve. I shot in jpg and don't have Lightroom, but will have a play in gimp and see what I can achieve.
I like starting with the "Curves" (or "Levels") adjustment under the Colors menu to increase contrast.
Pulling in the black point (the left-most point on the line/curve) will make the darkest bits darker (just be careful not to clip the blacks too much). And making the curve slightly S shaped will generally increase contrast. If the histogram doesn't quite touch the right edge you can pull in the white point, too, but again, be careful not to clip the whites too much (e.g. you don't want the sky to go completely white).
Also try to avoid over-sharpening. You will notice that dark lines/areas quickly will get a "halo" when you pull the sliders too far.