Thank you for your take on the content of the photographs! I did indeed struggle a bit with the framing of the first image, and I do like your idea, I'll have to play with that; my initial impression of the crop you sent me is that it is perhaps a little too aggressive, but I get the idea, and think it is a good one. Regarding the other images, I'll explain what I like about them, and if you see any way I could better have highlighted those features, please let me know.
For me, the second image actually has the more interesting composition, with the "hockeypuck" shape of the clouds being more or less echoed in the shape of the foreground (not perfectly, I admit), and the dark tree on the right forming a kind of counterpoint to the sun on the left that is just outside the frame; I imagine standing near the tree and looking out over the majestic landscape, bathing in the faint glow of the rising sun that you know is there.
The third image with the bench is a bit less strong compositionally for me, but I still like the general atmosphere, the way the path in the foreground sort of winds its way up to the bench and then the tree, the glow on the water, and the subtle yellow/blue contrast; there is also a small second sun star that I enjoy as a detail that is perhaps not immediately obvious. Again, I imagine the landscape from the point of view of someone sitting on the bench, except that for me it is also important that there is, in fact, no one sitting on the bench, as one of the things I most like about this area (in winter at least, and definitely around dawn), is how you can feel like there is no one (else) in the world (a rare feeling in the Netherlands).
The fourth image is the most problematic one for me. I like how the light wedge of sky and dark wedge of land are more or less mirror version of each other. I also enjoy the contrast and the "not completely and entirely flat" nature of the foreground, and some details (like the lone tree breaking up the line on the horizon). However, I feel the contrast between the lone tree and the line of trees on the horizon is too low, and in general simply wasn't 100% satisfied with the feel of the end result (in real life it was quite an impressive sight, with the clouds moving very quickly across the sky, and stark contrasts).
In any case, I truly appreciate all comments given so far, they are exactly the kind of feedback I was looking for!