Ivan Grave did a brilliant job with "Bieganski"'s cover. The cover captures both Shylock and Bieganski, the Brute Polak. The font is perfect. Above, an early version of the cover, with the proportions different from the final draft.
Ivan did several alternate covers, from which I was allowed to select my favorite. Those are below.
More of Ivan Grave's work can be seen here.
I especially like this cover: