I think you're a better photographer than you think. The exposures looked pretty good to me; actually I think this last version is getting overdone. I mean, it is nature, how much beyond what it actually looks like do you want to take it? how vibrant is the color in real life? Not that you can't make it less realistic and get creative, but it is a scene that is naturally occurring (well, much of it, not the barn itself! lol).
You might want to think about composition; you have more than one with a subject centered, which can work but often doesn't make for the best balance in a composition. Walk around some, change your vantage point, and see what other photos you can get from the same subject or scene. I also think the photo of the barn (great subject and nice photo of it) could be better if you could have gotten closer (although maybe that wasn't an option) to fill the frame more. I like the idea of cattails in the foreground, framing the barn, but as it is you've got one sticking up on one side and one that's dark lower right, and to me they end up being visually distracting. I'd think about if something adds to the photo, and if or where it should be in the frame. That's where you could change the vantage point and 'move' the cattails to where they look best as you're framing shots, where they look best in the composition(s).
Hope you keep enjoying taking photos, the more you practice the better you'll get. You seem on the right track.
(And I shoot all manual, most of the time; you may figure out what works best for you. I find it gives me the control I want over the camera settings.)