I think I'm going to make myself unpopular, but I agree with Dick here. The light is beautiful, the sky is superb, the tonal range is handled with great skill - but I can't feel comfortable with this composition. When I look at it, I keep wanting to see down. A portrait format, with the horizon line somewhat higher, would seem to suit the subject far better. At least, that's what I would have done in the same situation.
But obviously most people do not feel this way, and the picture does have many merits.