Cave Johnson by John Plumbe, Jr., from the National Plumbeotype Gallery, 1847, hand-colored lithograph on paper, from the National Portrait Gallery which has explicitly released this digital image under the CC0 license. (<a rel="nofollow" class="external free" href="https://npg.si.edu/object/npg_NPG.78.84.F">https://npg.si.edu/object/npg_NPG.78.84.F</a>)
John Plumbe, Jr.
National Portrait Gallery