Roosevelt Fine Art LLC William Vollmer (German-American c. 1850), "Portrait of Maria Keppler" b. 1817 (detail), oil on canvas William Vollmer was a German-American painter who painted this portrait of his mother-in-law, Swiss-born Maria Keppler, after she arrived in New York. Vollmer reworked this painting quite a bit, especially around the left side of Mrs. Keppler's face - her lips and eyes. Later repairs showed obvious discoloration. The work also had areas of loss of the image layer. "Portrait of Maria Keppler" after conservation (above and middle left.)
Sometimes more recent artwork requires more extensive attention than older works. The painting below by the Norwegian-American painter and designer Lorenz Kleiser of his daughter, Helene, was originally done on canvas in 1923. It was later damaged in an earthquake in California and was mounted on board. Over the years it experienced loss of the image layer and various dings and folds along the edges.
Lorenz Kleiser, "Portrait of Helene" 1923, before & after.