Dr. Travis Lee Clark is an artist in Big Bend, Texas, who posts videos showing the basic techniques of drawing pterosaurs, pterodactyls, sauropods, diplodocus, brachiosaurs and other long neck dinosaurs.  The videos contain educational commentary regarding subtle differences between the dinosaurs, how they moved, why their heads or teeth were shaped the way they were, and other interesting tidbits about anatomy of these prehistoric animals.

Art lesson (about 50 minutes) - Sauropods and other long neck dinosaurs

Art lesson (about 30 minutes) - Pterosaurs and pterodactyls