These portraits by Titian are recolours of justmoi's "Majestic Beauty" Painting. The mesh can be found here:
http://www.modthesims2.com/download.php?t=119548.
The paintings are Base Game compatible and do not require any additional Expansion Packs to appear in your game.
Credits:justmoi for the "Majestic" series of meshes and the SimPE Photo Studio templates;
Quaxi and the team for SimPE;
Images from Art Renewal Center and Web Gallery of Art.