Howdy, Buck. Yuh done a right smart bit of work on this abandoned ranch/barn. I too thought it was a bit subdued/flat at first viewing, but quicly realized it totally lost it's mood when darkened even slightly with more contrast, etc. The only item that I found distracting is that small flash of white, almost center, and probably more metal roof of another small building, and easily cloned out. Composition is excellent, with a great foreground lead-in.
You done good Bill. If you touched your saturation very much it probably would make for an icky sky. As for me I like the over all tonal quality my friend. I know because I tend to get color happy.:)