I like this very much Ken. Whether intentionally or not you have separated the image into thirds quite nicely which becomes very attractive to the eye. The leaping antelope in the middle enhances the interest. I wonder if you can extract more drama from the sky which is already quite nice but may have more detail and power in it. Of course, that could detract from the animals and you may not enjoy doing too much pp.
You mentioned the large crop but I noticed that you shot at 105mm, did you consider zooming to the 300mm mark?