The Art Styles in both the picture book and television series represents the tone and atmosphere for the continuities, as well as their specific themes and genre.
In the picture book series, the art style and illustrations are bold and dreamlike according to the publisher of the series, staying true to the nighttime theme.
Also, the feel and appearances for the characters are a generally a combination of characters from the superhero genre and folklore genre, and appear more realistic and dynamic than their television counterparts. The colors for the characters' costumes are also more flamboyant and brighter. The looks of the characters also appear more realistic and dynamic.
Notably, some of the female characters from the television series' pilot episode and picture book series have bigger and wider eyes than their television counterparts.
Overtime, this would lead to the art style matching the TV series art style. Eventually as of "Les Pyjamasques et le cadeau de Sorceline," a few minor alterations were applied such as retaining some aspects of the book series' original art style.
In the television series, unlike the picture book series, the art style and illustrations are comic book styled.
The art style also allowed the characters fit in with the superhero comic book genre such as the feel and appearances are mainly contemporary superhero themed, appear more cartoonish and have graphics of a superhero comic book than its picture book style. The appearance of the characters' costumes are often less flamboyant and slightly darker in tone.
Notably, some of the female characters from the television series' official episodes have smaller and narrow eyes than their book counterparts.