Two black-tie openings kept the museums of the Boston area and its formal-wear renters in happy collusion this week. Tuesday night, the Fogg Museum presented its latest original exhibit--investigating the works of 19th century architect H. H. Richardson. Richardson, who created Sever and Austin Halls among other masterpieces, was very cooperative in leaving his old blueprints lying around for the sake of posterity. They are very handsomely exhibited here, with early pictures of the buildings and Richardson's writing. A sneak preview of the show last Sunday proved fascinating. Now, with the finishing touches added, it should be outstanding.

Not to be outdone, the Museum of Fine Arts tonight opens "The Changing Image: Prints by Francisco Goya." Goya, perhaps the outstanding artist of the late 18th and early 19th centuries, was both a painter and excellent graphic artist. Many of his prints--especially those from the end of his career--exhibit a strange kind of ghoulish melancholy over the state of human life. This show takes Goya's etchings and, using loans from Europe and the United States and the museum's own collection, traces the changes he made as each print advanced from state to state. They exhibit as many as four preliminary drawings for a print, providing, in the Museum's words, "a rare opportunity to 'look over Goya's shoulder.'" The show will be here through December 29, and definitely should not be missed.