Not too bad. I do think you need to watch how your framing your shots. The top of his back and tail are cropped off. Mighty beast! Not a bad shot just a bit tight here and there.
Like the timing (to see the breath), would have liked less foreground and to see the whole back in the shot. In general more of the bison and less of the surroundings
A great animal to shoot, but think you could have found a better angle. Head on and closer would have been more fitting and would also have got rid of the white sky.
This might have been better if the hump and the rump weren't cropped off. To me that leaves an uneven balance in the composition. I'm sure it's not easy to be so near such a massive (and possibly dangerous) animal but see if, next time, you can keep the horizon level.
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