Beautiful ship designed by the famous af Chapman:
She is a frigate of the Bellona-class: http://sv.wikipedia.org/wiki/Venus_(fregatt)
Chapman also engraved tons of other ships. The drawings can be found here: http://www.sjohistoriska.se/en/Collections/Archives/ChapmanNet/ChapmanNet/Drawings/?pressimagepage=3
My absolute favourite is the frigate Jarramas: http://sv.wikipedia.org/wiki/HMS_Jarramas_(1759) She was not built by af Chapman, but by G Sheldon, a shipwright of British origin. Chapman did make a drawing of the ship later when it proved to be an excellent sailor. It is the number 11 ship here:
The original construction plans are in the national archives of Sweden. I asked if I could see them but they are not digitalised yet, so you can only look at them in Stockholm.