Thanks all. I really want to avoid too much post processing, so perhaps I'm too conservative. Specfic suggustions are most appreciated.
For the first image:
I'd go for more contrast in both the foreground and the middle distance. I'd lighten up the extreme foreground grasses considerably and go for more differentiation between the bands of colour in the middle distance.
Is the highlight in the sky clipped? If it was, I'd try to either recover that area, or clone some adjacent clouds into the "hole".
Superb conditions, beautifully shot. Well worth a little post processing.