#4 is great. I am noticing that it seems best to have some comparison point in a photo, as the windmill-like object (I forget its name) becomes in #4. There must be a term for this?
Without that, the first three pictures seem to be missing something. Clouds can be amazing, but look even more amazing when set against something else.
In one of those beginning photography books, I read about the importance of using the foreground, middleground, background to its fullest extent.
This gets me to thinking that I like photos that are like haiku poetry. Often, a haiku includes two concrete images that usually conflict with one another. Of course, there's a nature theme (often in conflict with humanity or itself), etc.
I've decided: I like haiku photography. :???: