I also like the mood on this one. My only nit...........and it's not a nit but more of an addition....since the post BG is white, a thin black border around image would stop the whites from bleeding into BG....especially on bottom.
Roman
I like the composition and mood of this one a lot. Agree with Roman that a thin border would help for this presentation. There is a small bit of something just on the edge of the frame, above and to the left of the left bison, that could be cloned away.