Don Manuel's storyboards for the season one He-Man episode "The Dragon Invasion" reveal numerous gems. Aside from beautiful artwork, the appearance of Strongarm, and a few deleted scenes, we also see that he originally requested that the Mother Dragon be a different shade of green, to distinguish her from the other dragons. Sadly, this was something that Filmation did not do. Aside from the request here we see once again another beautifully illustrated introductory piece for his storyboards.
(click on the image to see it at full-size)