As of my last knowledge update in January 2022, the faces on U.S. paper currency are as follows:
$1 Bill: The $1 bill features a portrait of the first President of the United States, George Washington.
$2 Bill: The $2 bill features a portrait of the third President of the United States, Thomas Jefferson.
$5 Bill: The $5 bill features a portrait of the 16th President of the United States, Abraham Lincoln.
$10 Bill: The $10 bill features a portrait of the first Secretary of the Treasury, Alexander Hamilton.
$20 Bill: The $20 bill features a portrait of the seventh President of the United States, Andrew Jackson.
$50 Bill: The $50 bill features a portrait of the 18th President of the United States, Ulysses S. Grant.
$100 Bill: The $100 bill features a portrait of one of the Founding Fathers, inventor, and statesman Benjamin Franklin.
Please note that there have been discussions and plans to update the design of some U.S. currency, including the $20 bill, which was proposed to feature the abolitionist Harriet Tubman. Changes to currency design are subject to approval and implementation by the U.S. Department of the Treasury. For the most current information, you may want to check with official government sources or the U.S. Bureau of Engraving and Printing.