[10] An ongoing collaboration with Heavy Metal[11] produced a large number of magazine covers including the 20th anniversary issue in 1997.

Royo's other well-known covers for fantasy and science fiction titles of this period included Robots and Empire by Isaac Asimov,[13] Conan by Robert E. Howard,[13] 2010: Odyssey Two by Arthur C. Clarke and StarMan and Wayfarer Redemption saga by Sara Douglass[13] among others.

[15] Later art books, (III Millennium, Evolution, Visions and Dark Labyrinth) explored the same genres combining science fiction, apocalyptic worlds and myths of beauty and the beast,[16] but received criticism for their explicit content.

[19] The original paintings were exhibited at Salón del Manga de Barcelona,[20] ExpoManga[19] and retail store Fnac.

[26] As a culmination of his artistic career, the Uffizi Gallery (Florence, Italy) has requested his self-portrait to add it to its collection.

Reports on his work also appeared in other publications: La Stampa in Italy, Airbrush Action in the United States and Penthouse Comic in Germany.

In 1998 Royo exhibited at the Norma Gallery in Barcelona and at the Viñetas desde o Atlántico comic festival in A Coruña.