Just figured out how to do a few things on Twitter.
Don’t be misled by the photo.
That’s cropped from Lorenzo Lott’s oil on canvas work c.1550 (public domain).
I was going to put up Ben Franklin, or my cat's mug, or a barking owl's - but in the spirit of a semi-tamed vanity (gods help me), I finally settled on Lott's.
http://twitter.com/Diplopundit