Good concept.
I like the hazy back ground and sky. Has a water color kinda effect.
Suggestions...
The horses are all in the same stance.
It stood out in my attention. Can you alter the legs and horizontal body angles a bit?
Also, rotate the couple in the foreground just a bit more clockwise. It's difficult to distinguish the two in the current angle. They are your center piece. Maybe pull them in a bit closer to the camera?

Again, great composition and story here.

M