I'd like #1 if you can fix the colors (lots of blue and purples, and really harsh blacks) and the horizon.
#2 just looks odd to me. The narrow path and the huge horse across it just looks a bit forced to me.
#3 - love it. just wish there was a bit more breathing room to the right of the frame.
#4 - I want to love it, but I think it would have been more successful if you had shot it level. If anything, I'd try to recover the hotspot on the horse's back to separate it from the sky.