This site shows original portraits upon which faces were created that we keep every day in our pockets:http://www.trackthetime.com/fun/us-currency-portraitsFrom the comparisons it appears that the likenesses of presidents after the dawn of photography (i.e. Lincoln and beyond) are more accurate than portraits based on paintings.  Andrew Jackson's eyes, for example, appear a bit more stately in the $20 bill than in the portrait, where he appears to look off slightly into space.