That's very beautiful.. I love the POV as well...
Just one thought, did you mean to keep a kind of magentas colour in the sky?
Paul, as you know, I don't do MODs on other people's photos, I'm learning... I really love this image.So I decided to give a closer look. I tried to use selective colour to reduce the magentas colour, but failed. And then I checked your ISO(800), it was noise. I tried noise reduction, it worked well. You don't need too much strength, 1 or 2 will do, because you would lose the sharpness of the horse if the strength is too high, but I pushed colour noise reduction up to 100%.
Still, an excellent shot with beautiful sky...

BTW, thank you very much for your kind and helpful comment on Corfe Castle.
Jasmine

Love the colour and silhouettes. I think the ISO's caused you some noise, it's difficult to set ISO. I dare not to set it high on my church photo, but ended with less sharp image.Maybe high ISO is a choice,simply get rid of the noise later...