The Sleeping Gypsy

The Sleeping Gypsy (French: La Bohémienne endormie) is an 1897 oil painting by French Naïve artist Henri Rousseau. The fantastical depiction of a lion musing over a sleeping woman on a moonlit night is one of the most recognizable artworks of modern times.

It appeared as one of Mr. Ratburn's puppet shows in "Arthur's Lost Library Book".

Oddly enough, the woman does not appear to have any animal characteristics and is a rare brief moment when a human is portrayed in the series.