http://www.sfchronicle.com/art/article/Pre-teen-artist-rises-to-challenge-at-Silicon-11090929.php
After Four Years, He’s Still The Youngest Artist In San Diego’s Artists’ Alley
http://nerdist.com/young-artist-shows-skills-with-spider-man-art/
Articles/Mentions
https://imaginationinternationalinc.com/inspire/wondercon-2017-recap/
http://www.joblo.com/movie-news/awesome-art-we-ve-found-around-the-net-spider-man-homecoming-103
http://isotopecomics.com/index.php/tag/ethan-castillo
https://www.newsarama.com/25004-hero-initiative-plans-signings-2-parties-for-sdcc.html
https://www.heroinitiative.org/tmnt_castillo-ethan/
http://www.comicartfans.com/searchresult.asp?txtsearch=Ethan%20Castillo
http://comicbook.com/category/ethan-castillo-comiccontributor
http://chrisgiarrusso.com/fan-art-friday-ethan-castillo-4/