Thierry Doizon, who goes by the alias Barontieri, is an artist living in Montreal who does concept art and illustration for games and interactive media. He has done work for for Ubisoft, Disney Imagineering, Peugot, Artari and others. The gallery contains illustrations, 2D and 3D experiments and color “sketches”. As is often the case, I find the quicker work even more appealing the the finished pieces.
Doizon provides tutorials and downloadable Photoshop CS brushes in the Atelier section, and provides information for arranging personal instruction in the Services section. The Atelier page also includes links to other sites that showcase his work.