Just revisiting this concept for fun, since it did end up on the show in a way.
I get that Mark's ten year old human disguise on the show is meant to make it easier for him to hide behind Timmy, but hey- whatever happened to his Vicky-lovesickness? (surely she didn't manage to hug it out of him before?) So anyway, I combined some elements of the "Mark as a human"
picture from early last year that I did (wow I had to dig for that!) with some of the things that they used for Mark's human disguise on the show.
It's a sort of jarring mix, isn't it? Especially that huge Yugopotamian necklace. I can't help liking the idea of Mark with a big, aesthetically-scarring piece of jewelry, though! ^^ Oh well.