Very nice. Could have been sharper and more space to the side the pony is looking. Check if you are compressing/resizing the uploaded images too much. This could have been a winner if it was done right.
I agree with Sundar. This is one of your best shots for subject, colour and action. To bring it to the next level, try Shutter Priority (Tv mode) / 1/1000th - 1/2500th / Auto ISO. This will freeze the action and keep it nice and sharp. You seem to have plenty of light to facilitate that. Good luck!