The 90yen stamp on this cover is from 2009 issue of popular International Letter Writing Week series,showing a famous painting by Utagawa Hiroshige.
Utagawa Hiroshige (1797-1858) was a Japanese ukiyo-e artist, and one of the last great artists in that tradition.His most successful work is The Fifty-three Stations of the Tōkaidō (1833–1834). These designs were drawn from Hiroshige's actual travels of the full distance of 490 km. They included details of date, location, and anecdotes of his fellow travelers, and were immensely popular.The stamp shows the 7th station.
Hiroshige’s The Fifty-three Stations of the Tōkaidō and One Hundred Famous Views of Edo (1856–1858) greatly influenced French Impressionists such as Monet. Vincent Van Gogh copied two of the One Hundred Famous Views of Edo which were among his collection of ukiyoe prints.