On June 15, 2015, the cover art was revealed for the first graphic novel edition of Steven Universe, which Valero-O'Connell illustrated.

The comic was released in December of that same year under the title "Steven Universe: Too Cool for School".

Studios on a crossover comic issue of Gotham Academy and Lumberjanes as primary illustrator.

[6] In 2016, it was announced that she had begun illustrating a graphic novel with Mariko Tamaki for First Second, Laura Dean Keeps Breaking Up with Me.

[9][10] In 2018, Valero-O'Connell was nominated for two Eisner Awards, Best Coloring and Best Single Issue / One-Shot, for her comic What is Left.