I like the edit by
@tirediron the bump in contrast really makes it pop. As he pointed out the reflection on the mill is an important part of the image but I'm not sure that the treeline reflection in your original isn't important as well. Would be nice to see your original crop with the increased contrast for comparison. In any case you have the makings of a great capture.
^^This. I like the original crop. The reflection is important, but so are the lines of the shore. The composition is not the issue. The black point is fine, but I think the highlights need to be bumped and the midtones are a bit muddy. That's what makes the right side of the image feel flat, making the left side with the building, which has more tonal range, feel heavier.
I like those wisps of branches on the top right corner - they help balance and frame the shot. I'd try to bring them out a bit more. I wish I knew the best way to do that, but I'm not skilled enough in software processing. My first thought would be to go in close and use the burn tool just a touch on a few of the branches. I just don't know how useful that thought would be