I would have scored this higher had it been done like a triptych with 3 distinct frames around the horses. As is, you are trying to present them as three different horses yet your repeating background, blurred space between them (which almost comes off as dust) and uneven fence line show they are merged images, framing them would have hidden this better and maybe made the view belive a little more that it could be 3 different horses.
I suck at cloning so I'm not the person to ask how to do it better, but it is somewhat apparent in sections. The overall presentation is quite intriguing, though!