For those who are interested, I did a lot of editing on this image.
First denoised everything.
First I selected the horse in front and put that on a new layer.
Then I reselected and added the second horse and the foreground and put that on a new layer (lots of feathering on the junction between foreground and background (where shadow started)
Then I reselected and inverted the selection to bring the upper part and the background onto its own layer.
The background layer got darkened a bit and lens blurred a bit
The foreground and horses got smart sharpened. (and warmed)
The front horse got more intense sharpeneing and local contrast enhancement to make that pop out more. (and warmed)
Then merged all to a new layer on top.
Added a new layer in overlay mode and darkened to the top two corners.