Lovely scene. Technically everything seems OK on it - except for the composition. In cases like this, if you place the main compositional element to the centre, it becomes too static, even boring to the viewer. Try to place the subject to any of the thirds of the pic (left or right). Here's a little help of what I'm talking about.
In case of living creatures, also including animals, it's better to allow more space in front of than behind them, in the direction of their look - and voilá, you already solved the problem of thirds! Another, also important item is composing a complementary element on the photo, if possible, and never in a direct (horizontal or vertical) line with the main subject. Unfortunately, on your shot, the dried tree is in direct line with the gnu.
In the case of this photo, you should release the shutter a couple seconds sooner, to use both the gnu and the spectacular dried tree as important elements, or wait some more seconds while the gnu walks away from the tree and they don't make a disturbing vertical line together. So, the main problem of the photo imho is the bad timing. Something to be alert of, but something may be learned with practice.
Good luck to your future captures, I'm looking forward to see new shots of you. Have a prosperous new year, best regards, László
Blue Wildebeest (11)