First, I've started taking both RAW and JPG files. I quit taking JPGs a few years ago, but now I have plenty of disk in the camera. More information, even if it is not used ain't all that bad.
The RAW image:
The Original Nikon JPG
By the histogram, it looks like the RGBs were reduced pretty evenly and added some dark blue.
Its OK, but not to my tastes. First the golden vegetation has real possibilities. I like yellows. But I need more definition and a touch of saturation. I think the real center of the picture is the white siding of the barn. Again, more definition of the weathering. And to finish up, the green on the tree and silo ivy is just plain boring, just some saturation. Also, if I can do something with the sky in terms of clearing up the dull blue, that will be a bonus.
Now that I'm getting very comfortable Photoshop, I'm getting a solid workflow to 'prep' the image. I start with the RAW filter. In the RAW filter, I use the Transform tool to set the overall picture horizontal and vertical elements and correct for camera distortion. Sounds busy, but I pretty much let PS do all the work.
In this case, there was some adjustment.
My next set of adjustments came from On One. I tried the NIK adjustments and nothing suited me. In On One, I used Dynamic Contrast and Grunge filters.
On One Adjustments:
Now we're starting to get somewhere. Starting at the top, the sky/clouds are starting to get some edge to them. The tress and ivy have a lighter color and you can see much more definition.The flat white on the barn side is disappearing. Not yet where I want it, but it is a start. And as a bonus, I'm seeing some definition in the roof and silo. The histogram is showing the image darkened a bit so I'll want to recover some overall light. I used the RAW filter again to bump up the yellows and greens just a bit.
The Final Image:
I think I got what I wanted. The sky has some definition, without looking too altered. The tree and ivy have more color and definition. The white barn siding isn't so bright, looks more weathered and detailed. And the gold sea looks a lot more detailed.