Young Mother and Sleeping Child by Léon Bazile Perrault is a recolour of justmoi's "Majestic Allure" Painting. The mesh can be found here:
http://www.modthesims2.com/download.php?t=268291.
You will need the Base Game plus at least one other Expansion Pack for this painting to appear in your game. It does not matter which one.
Credits:justmoi for the "Majestic" series of meshes and the SimPE Photo Studio templates;
Quaxi and the team for SimPE;
Image from Art Renewal Center.