The current sketch card set I'm working on is Presidential Portraits by Pastime card company. Sketch cards are, simply put, standard trading card sized drawings (2.5x3.5"). All of these are done with copic markers. I've got just 2 more to complete the set but later on I'll have more as I will have artist proofs to do once the set is released.
see more of my sketch cards here: http://www.bradutterstrom.com