I don't know if I'm just unlucky with buffalo, but in the 15 years that I've been visiting nature reserves or game parks this is the least photographed animal in my albums. I have more wild lions, leopards, cheetahs, wild dogs, etc, on photo than buffalo. For some reason they just never want to stick around when I'm around. I'll see the most beautiful animal in a distance, approach with care, and then only watch as the buffalo makes a hasty disappearing trick. The few I do have I mostly had to work hard for. That is why I always appreciate a good buffalo shot and this one of yours rates well.
The beast assumed an excellent pose for you standing at an oblique angle with the head turned slightly towards you. Wow, what a POV. Of course he is covered in yuk, something which buffalo adores doing lying or rolling around in the mud. The only slight nit I might express, and these are plainly PP issues so it is not a big deal to rectify or optimise, but I feel you could bump the sharpness up a tad through USM and while you're at it maybe the saturation as well.
Otherwise this is a perfectly fine photo. Well done and TFS.
Mud Covered Buffalo (80)