Heya gds, welcome to ThePhotoForum.
You did see a buffalo in the wild? That is so cool!
Some critique about the composition of the photo: your subject is very centred. You will find out that pictures as such (photos and paintings etc) have more impact, capture the eye more when the subject is not smack in the middle of the frame but moved somewhere off centre. If you could not achieve to get it done in-camera, maybe because you were driving past your subject, you can always still do it in post processing by cropping your original frame differently. This photo gives you room enough to test out all sorts of crops.
I am not entirely sure about the tint you gave this photo.
Maybe my thoughts are too cliché, but I would always want to see "the prairie" (where I picture buffalos) to look "warmer" in colour. But that may well be a very personal thing...