Upload & Sell: On
Lovely photos. Color looks great. I am mad at you, though. I've been looking at the 14mm and your post is pushing me further in that direction.
I don't think it's too wide for sunsets. Also, I think your composition that "breaks the rules" works well here. I like that you gave the sky and the field equal weight by putting your horizon line in the middle of the frame. You're in good company, look at Sam Abell's photo here.
Yep in a standing position with a more or less level ground, the horizon is going to be near the middle. This is how I see it in person and thus how I want to show the image. I typically shoot at standing height and with a level camera. I use my shift lenses to get up or down if required.
I have done wheat before and I think you need to show some leading edge rather than to start it further into the field. This sort of dictates the placement of the foreground.
UWA often has either too much foreground or too much sky and makes a 16/9 crop a common choice of mine. The first image could benefit from such a crop taking all off the top. The second, how could I take any of the sky away?
For me content is a big factor in composition. Its more about including or excluding than about guiding the viewer.
The comment about 14 being too wide. A longer focal length emphasizes the color but when the entire sky lights up, WA works fine. .