The photo is beautiful. Since it is really what the moderators see that matters for acceptance, it would be helpful if you post here what it was that the photo was rejected for. I will however state my finding
I believe there is a color noise issue. Looking at the cavity of the rock at 150% the colors do not seem to be smooth. I can see articial coloring.
I also believe the hair of the zebra on the right is not completely sharp.
Also the face of the animal in the middle is not detailed enough. In my opinion it requires increasing the black, and probably the shadow slide on the photo editor.