His interests expanded into comics and by the early eighties he was published internationally in such magazines as 1984, Comic International, Rambala and occasionally, El Vibora and Heavy Metal.

In 1983 he began a longstanding relationship with Norma Editorial and devoted himself to illustration, quickly becoming a predominant force in the fantasy and sci/fi fields.

Nowadays, Royo's work can be seen all over the world, having been published by such notable companies as Tor, Berkley, Avon, Warner, Bantam, Zebra, NAL, Pocket books, and magazines such as Heavy Metal, Cimoc and Penthouse to name but a few.