Hi Grahame, I would suggest the same thing (selective color adjustment layer) as Judith has done already. I use it in some of my sunset shots and because it is a detailed and effective tool I find it very useful in some situations. Let me explain. When you choose a color let's say blue you will see cyan,magenta,yellow and black color sliders in the blue color window . So, by adjusting those sliders you actually adjust the cyan,magenta,yellow or blacks in the blues of your image. So , you are able to deal with the colors more effectively
BTW both images are very nice , my fav is #1 with its composition and colors