Cover: the actual cover art from a comic book. Splash page: the first page of a comic book story, usually made of a single large panel and an indicia with the title and credits of the story. Interior splash page: Like a splash page, it has a single full-page panel, but no indicia or title. Pages with a half-page panel are also called half-splash. Double page splash: two side-by-side pages filled by a single image. Double page spread: two side-by-side pages with multiple panels, meant to be read all the way across the spread. Panel page: an interior comic book page that consists of more than one panel. Panel pages vary widely in number, size and form of panels. Prelim: a roughly-drawn piece of original comic art that was done as a guideline of a more detailed and highly finished piece, or to get approval (typically for covers). Such artworks, even if rarely published, are interesting as part of the artistic process of the penciler. Commission: a commission is a comic artwork (usually an illustration) that you pay an artist to do for you. The more complex / finished the commission, the more expensive. Convention sketch: some artists attending conventions will do sketches of a character of your choice. Some do them for free, some will charge you (for charity or for themselves) - sometimes after a draw to determine the lucky collectors who will get one. "Dédicace": in French, a "dédicace" (translation for "dedication") is an original drawing executed by a comic artist, often on one of the blank pages starting the album, and usually dedicated to a reader. Such drawings could be assimilated to convention sketches. In Europe they are generally free of charge, but you may have to buy your book during the convention. Some resources: Marvel Covers, The Modern Era (Artist Edition) - Splash Pages and Panel Pages (Prop Store) - All Splash Page Comics - Sean Murphy sketches Constantine @NYCC 2011 - Dédicace de Corboz (Angoulême 2016)