It looks like the Duke himself has been portrayed here : https://i0.wp.com/myfavoritewesterns.com/wp-content/uploads/2016/03/the-big-stampede-1932-5.jpg?ssl=1 Artist could be William Soare (if so, this is one of his last -post mortem- covers for he died in march 1940, at only 42). Reply
It looks like the Duke himself has been portrayed here :
https://i0.wp.com/myfavoritewesterns.com/wp-content/uploads/2016/03/the-big-stampede-1932-5.jpg?ssl=1
Artist could be William Soare (if so, this is one of his last -post mortem- covers for he died in march 1940, at only 42).
I second that opinion. It looks like William Soare to me, too.