Thanks for posting these. It's interesting to see non-US romance comics. Having seen so many of the Selecciones Ilustradas artists during the 1960s I expected a fancier art style here. Except for Colmeiro, these have a simpler approach that reminds me of Art Capello's work at Charlton (though better-drawn). One nice touch is that the young people actually look young. American romance heroes and heroines always looked ten years older than they were supposed to be.
Link to the book:
Serenata 022 Una gran bailarina