WILLIAMSBURG, Va. — When the young sculptor Asa Ames (1823-1851) died shortly after his 27th birthday, he left behind nearly a dozen carved portraits, many of which are signed. Most of his sculptures portray family and friends, including a wooden bust of the artist’s nephew Millard Fillmore Dewey (1845-1916) at the age of two. This likeness descended from the subject through his son and was recently given by bequest to the Colonial Williamsburg Foundation. The bust of Millard Dewey is the third Ames portrait to join the foundation’s esteemed American folk art collection.