These four paintings by Pissarro are recolours of SvetLanka's "Angels" Painting (
http://nene.modthesims2.com/download.php?t=255179). The "Angels" Painting is a wooden-framed recolour of The Lady on Red from the Base Game.
If you are interested, you can find more paintings by Pissarro at The SimsValley3 Forums
http://www.simsvalley3.com/index.php. They are part of a series exploring the history of painting from The Renaissance to Modernism. Registration is required before you can download items.
Credits:SvetLanka for the "Angels" painting;
Quaxi and the team for SimPE;
Numenor, Quaxi, R Giles for the CEP;
Images from The Athenaeum, CGFA, Wiki Commons.