The Danish weekly <i>Illustreret Tidende</i> had an article on Mart 31, 1889 about Vilhelm Kyhn to his 70th birthday. This is one of the illustrations, showing Kyhn in his studio.
<bdi><a href="https://en.wikipedia.org/wiki/en:Peter_Tom-Petersen" class="extiw" title="w:en:Peter Tom-Petersen"><span title="Danish painter (1861-1926)">Peter Tom-Petersen</span></a>
</bdi>
1887<div style="display: none;">date QS:P571,+1887-00-00T00:00:00Z/9</div>
<a rel="nofollow" class="external text" href="http://img.kb.dk/iti/30/pdf/iti_30_0318.pdf"><i>Illustreret Tidende</i>, Mart 31, 1889, page 314</a>