The trick was getting a background that didn't distract from his averted gaze. We were on a fairly busy porch just outside a saloon. He was graciously patient as I waited for the activity to subside and I could snap this shot.
My primary compositional concern was the brim of his hat. As this image is not cropped, I tried to place it so that it would just kiss the edge of the frame. Finally, I gave it a little warmth in Lightroom and it was go to go.