Carte-de-visite of Prince Albert. This rather informal portrait of Queen Victoria's husband shows him as thoughtful and scholarly.
<bdi><a href="https://en.wikipedia.org/wiki/en:Camille_Silvy" class="extiw" title="w:en:Camille Silvy"><span title="French photographer (1834-1910)">Camille Silvy</span></a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nationalmediamuseum/7936243058/">Albert Prince Consort, c.1859.</a>