I think you captured the elusive nature of the hook-lipped nicely with this frame. I feel it needs a bit of saturation/contrast to make it pop a little more. nice one!
The Rhino in question Mvura was about 5 metres from our vehicle. She was raised at Imre Sanctuary in Zimbabwe and released into the wild several years ago she has a young calf called Murume of whom more later.
We were actually in a Series 3 Land Rover, she is not very concerned about human presence although her son is a little skittish. I have some "normal" photos that I will post later. The reason for posting this was "shock value".
I hoped to draw attention to the fact that Black Rhino still exist in Zimbabwe in spite of what you read in the press.