Here is an interesting piece of development artwork from the season one He-Man episode "The Curse of the Spellstone". Here we see that one of the Filmation artists originally intended for Evil-Lyn's disguise to be much closer to her typical look, but merely have her clothing altered, rather than her entire physicality. I like how even as Zenia, Evil-Lyn retains the same pose she sports for her normal character model sheet. Old Zak's design is also vastly different to how the character appeared in the actual episode. It would have been interesting to see Evil-Lyn with a simple disguise, but I for one am happy that they completely altered her character for this particular episode.
(click on the image to see it at full-size)