I just saw this in the #Elite-Equimanips group and I really like this manipulation. It's really pretty and you have a REALLY good choice of stock.
I was examining this piece and the only tiny piece of critique I can offer you is that the shadow beneath the horse seems a bit too dark - it should be dark grey and more transparent, not so black. The hair could also use some more colors but it looks fine the way it is.
Now onto the good stuff:
4 1/2 stars for Vision because the choice of stock is superb. You can clearly see through the valley - and what a gorgeous scene it is. The stock just works really well together.
3 1/2 stars for Originality as the idea of a horse running next a river isn't totally original but the way you put it together was. This angle isn't seen all that often.
4 1/2 stars for technique as your lighting looks natural and done well, as is your hair painting. Those two are really difficult to do. Your background blending is done fairly well although I still do see a faint line by the river where you blended them together.
4 1/2 stars for Impact as the choice of stock REALLY works well together and the angle of the horse just really works with the rest of the manipulation.
Good job and keep up the good work! Make a few more like this and I hope to see you as an actual contributor at #Elite-Equimanips! (Once they open again; not sure when :/)