"Pray step into my little sanctum . . . . An oasis of art in the howling desert of South London" - Thaddeus Sholto (SIGN).

To pass the time, Watson and Holmes browse the works of the "Belgian Masters" in the Bond Street Picture Galleries. But regardless of their mutual presence in the galleries, Watson and Holmes had considerably different opinions on art as a whole. Watson went so far as to claim that Holmes knew nothing about the topic (mainly because their opinions on it differed, not because of any evidence that Holmes could not hold his own in an art gallery).

The Belgian Masters they browsed might have included:

Robert Campin (Master of Flémalle) (1375 – April 26, 1444), considered the first great master of Flemish painting
Rogier van der Weyden (1399 or 1400 – June 18, 1464), one of the greatest Flemish painter
Barnand van Orley (1491 - 1542) , a significant Flemish artist
Dirk Bouts (c. 1415 - 1475)
Hieronymus Bosch (c. 1450 – August, 1516) , a prolific 15/16th Century Dutch painter
Quentin Metsys (1466 - 1530), a founder of the Antwerp school
Jan van Eyck (c. 1385 – July 9, 1441), one of the greatest 15th Century Painters
Jacob Jordaens (May 19, 1593 - Oct. 18, 1678), a Flemish painter
David Teniers (the Younger) (December 15, 1610 - April 25, 1690), a celebrated Flemish artist
Anthony van Dyck (22 March 1599 – 9 December 1641), A leading Flemish painter who became an English Court painter

The Ugly Duchess by Quentin Metsys

Flemish Kermess by David Teniers

Van Dyck Self Portrait

Beyond this, there are no other references to Watson and art. But one may speculate that while he did not go out of his way to imbibe art, he did appreciate it when he happened upon it.

Information on Belgians Masters adapted from articles in Wikipedia.org.