een voorstudie uit 1836
<bdi><a href="https://en.wikipedia.org/wiki/en:Nicaise_de_Keyser" class="extiw" title="w:en:Nicaise de Keyser"><span title="Belgian painter (1813-1887)">Nicaise de Keyser</span></a>
</bdi>
1836<div style="display: none;">date QS:P571,+1836-00-00T00:00:00Z/9</div>
<span class="int-own-work">Self-photographed</span> by <a href="//commons.wikimedia.org/wiki/User:Paul_Hermans" title="User:Paul Hermans">Paul Hermans</a> on 9 January 2010