G. Grenville Manton - Royal Academy Conversazione, 1891

watercolour, 1891
17 1/4 in. x 23 3/4 in

Pity it's not in colour.
This page gives the many famous painters included, but not where?

http://www.npg.org.uk/collections/search/portrait.php?search=as&grp=1120%3BAesthetic+Movement&lDate=&LinkID=mp02691&page=1&rNo=7&role=sit