French to English Art/Literary Photography/Imaging (& Graphic Arts) Contract to publish comic strip album

This is a deceptively simple one. I am translating an agreement for the assignment of rights to adapt a comic strip/graphic novel-type work and two 'auteurs' are mentioned:

auteur des dessins
auteur des textes

who are then referred to jointly as 'l'auteur'

In the context of, say, a children's book, I would simply call these the illustrator and the author, but it's not so simple in the world of the cartoon/graphic novel (where usually the artwork has the most impact). Should one be referring to 'the author of the artwork' and 'the author of the text'? Or is there a more accepted phrase?

In terms of context, there's not much specific to these two terms, but here is a further reference to the work in question from a parallel contract which I am also translating in this connection (L'AUTEUR here refers, again, to both the 'auteurs' mentioned above acting jointly):

"L'AUTEUR, qui possède toutes les prérogatives à lui conférées par le Code de la Propriété Intellectuelle (Loi n° 92-597 du 1er Juillet 1992), cède à titre exclusif à L’EDITEUR qui l'accepte, le droit de reproduction et de représentation des bandes dessinées qu'il a réalisées pour le Tome .. de la série intitulée « ……………. »"