I think a curves adjustmenst layer to bump up the contrast would help these pop a little more. Nice job though and good timing catching the horse with it's eyes shut.
I was going for the kind of low contrast look in the first one, I may need to work on that processing some more. The others I will definitely try to give them some more pop.
And on the last one it would have been nicer with your light coming from camera left. So you have some shadow detail on the horse's neck. (But I am on laptop on non-calibrated monitor so it may not be as dark as I think) But it is still really nice.
You are right on this one, I would've like some more detail on the horse's neck. I ended up adding a reflector for some of the later shots with this set up but moving the light would have been a better solution I think.
Two VERY minor thoughts that might improve the shots a little:
On shot 1, crop off the bright area on the right of the photo as it draws my eye away from / distracts from the intimacy of the shot.
shot 2 crop off the back wall on the left, because almost all of the other lines are leading towards the subjects, those lines seem just a bit distracting.
Good eye on the leading lines, the second one looks a lot better with that wall cropped out.
Thanks for all the C&C and the compliments too.