Luces y sombras (1988)

This film within a film is based on the painting Las Meninas by Diego de Velazquez. A young boy enters the canvas of the famous picture of the Spanish king and his court. In order to return to the real world, he must convince the artist to create his famous painting. The other plot involves a film director who is not sure how his film within a film will be created. He is distracted by his troubled marriage and has difficulty focusing on his project.