Nordic Designs said:
The dark lines look much better now! And sometimes honestly the green isn't even the background. Sometimes it's just the lighting being a little more green on the legs like it's reflecting.

The eye looks a little better but it could still use some of that "shine" so to speak to make it look a little more rounded. Doesn't need to be huge as it can EASILY overwhelm the eye. The dark shading could be a little lighter on the face as well

Aside from that, the background is more clear than the horse so the background could use some blurring to make it seem like the horse is the focal point.

Your hair is wonderful, keep up the good work :)

Future reference the higher quality horse stock you choose the more clear and clean it'll come out and look :)