Such a great piece! The characters both have a lot of, well… character! I can just hear that buffalo, like: "YOu got a problem, bub?"
I like the backdrop as well. The loose styling draws attention to the figure, but the strong curve of the horizon really adds to the sense of drama.
I've taken the liberty of suggesting this image to , as I believe the group will enjoy it as well. I hope you'll consider accepting the invitation.