Travesuras de la Modelo (Model Making Mischief), circa 1885.
Raimundo de Madrazo y Garreta
Via Books and Art
There is just something I like about painting people who are themselves painting. And I like this saucy senorita's expression as she puts her distinctly unprofessional addition into the art. Plus I'd love to have a dress like that.
Books and Art has some info about the artist and many beautiful pieces of art on display.