Quite the opposite of this thread (Should we put Martin Luther King Jr. on our currency?).
I oppose the use of historical likenesses on currency, no matter what nation, no matter which people. I find it (A) an abuse of historical notions of "Great Men", (B) pointless insofar as it actually degrades the memory of the person in question, and (C) aesthetically displeasing.
I, personally, prefer abstract designs: I'd also oppose the use of national symbols (eagles and Columbia in America, maple leaves in Canada, the crescent-and-star in Islamic nations, etc.) for much the same reason, but I am more amenable than I am to the use of people on money, which is much too on-the-nose.