The Enchanted Forest

Enchanted forests are a pretty cool idea I think that horse should totally have a horn, because enchanted forests are full of magic, right? ;D

It's nice that this is a simple picture but it gets the point across. There isn't too much activity so it's easy to focus on the horse which is what I'm assuming you were trying to do. Both pictures you chose were good shots and mesh well together. Also, having the tip of the horse's muzzle and three of the hooves within the grass instead of all being on top makes it look more realistic and was well done.

One thing I noticed on the grass beneath the horse is it's very lit up. Was that done on purpose? Since the light source looks like it's coming from above, there would be shadows beneath the horse to match the shadows on the belly and other parts of the horse (the way I would assume you could get around this is by saying that everywhere the horse walks it lights up because it's magical).

Also the white line around the horse is still a bit too strong and stands out against the darker trees and grass, especially around the belly and legs. Trying to make sure there is no white line around the horse would help this picture seem more natural (though honestly I have very little experience with photomanipulation so I'm not sure exactly how hard or easy it would be to do that; for the back, head, and tail you seemed to have gotten rid of the white line completely and they look good so having the rest of the body match would be even better).

The lighting on the horse too seems a bit weak compared to the lighting of everything around it, so maybe strengthening the lighting would help a bit too?

Overall it looks good and definitely stirs the imagination I'm sitting here wondering what kind of magical creatures are lurking around in the grass and trees, silently watching the horse pass through...