In addition to classical art types like paintings, sculpture, music, dance, and movie, new types of artworks emerge as the advancement of social platforms, media capturing devices, and media processing tools. Large volumes of user-generated content or professionally edited content are shared and disseminated on the web. Internet users can browse, comment, edit, and sometimes creatively re-compose this content to generate new media, giving new viewpoints or interesting applications. Novel multimedia artworks, therefore, emerge rapidly in the era of social media and big data. For example, pixiv.net is a social platform where amateur artists/illustrators can share their illustrations/comics, and internet users can annotate, rate, and collect favorite works. The ever increasing amounts of illustrations/comics on this platform give rise to challenges of automatic classification, indexing, and retrieval that have been studied widely in other areas but not this emerging type of artwork. We encourage theoretical, experimental, and methodological developments to solve the wide range of challenges derived from multimedia artworks in traditional forms like paintings, photos, movies, as well as novel forms like comics, animation, gaming and VR/AR.