A lot of shots to comment on. I'll select one, the third one down in the first series. Beautiful colt, lovely setting. I think if you composed the shot with the colt to the right instead of centered it would look a little better. It would give him space to "walk" into. If would also help if his feet were not cropped so closely on the bottom. I like the sheep behind him, seems to add to the bucolic scene, but not too crazy about the two shrubs/trees.
Since you have so many images in your post and virtually all of them are just variations of the same shot, perhaps you would like to pick the one that is your favorite, the one you feel is the best. Then ask some specific questions about what you would like to improve such as composition, lighting, dof, etc. We would love to be able to help
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