Hi Phil. Quite a nice effort here but I can't help feeling that the inclusion of a human figure - or even a boat! - would have helped give a sense of scale here. It has a somewhat deserted look.
As regards the crop, I don't think the area to the left of the photo adds a great deal and it could perhaps be usefully cropped out. I'm not too keen on the deeply cyan coloured clouds and these could be selectively desaturated. A contrast boost, via a curves adjustment, may help to increase impact. (Some areas of sky have bleached out but, other than cloning, there's not a great deal that can be done about that now).
I've uploaded a mod which reflects my comments, which I hope help.