Thanks for you kind words on this one, John.
No polariser used, so I was pleased with the sky.
I am trying to get to grips with both Raw Therapee and PS7 at the moment - a lot to learn still! At last I think I am getting the hang of layers, and I try to use a separate one for each of levels, curves, saturation and colour balance of an image, so that I can see the effect of turning on or off each alteration stage in the PP. I also now realise the value of using the function keys, for showing and hiding the palettes, [and for a lot of other things] - much quicker than continually pulling down menus with the mouse. I also find Luko's sharpening method excellent for nearly everything.