godan verb (-su), transitive verb
draw specially; create original artwork
Used for creating original illustrations or artwork, often for a specific publication, product, or purpose. Implies the work is newly produced rather than reused.
この漫画の表紙は、作者が描き下ろしたものです。
The cover of this manga was drawn specially by the author.
展覧会のため
I will create a new work specially for the exhibition.