I'm not particularly interested in him, but I would like him more if he had a nose like the one shown in the original post. While there are some villagers I like who lack noses, like Ankha for example, I usually dislike it when villagers lack noses. I especially dislike Flurry for this reason.
If the nose would fit along with the rest of his design, I assume he would be still as popular as without one. Personally, I prefer him without one, just got used to it.
Fascinating how a little dot in the face can change his whole appearance so much. Overall, I do think Marshal would still reach high popularity in the community even if he would own a nose. It's the cranky/smug-ish look he has that makes people like him so much (at least from what I see and hear) and I think a nose would not ruin this that much (as long as said nose has a decent shape and size. A gigantic, weird looking nose for example may turn him into a joke). Personally, I like Marshal with and without one.
He would still be popular, maybe even more popular. I think that’s the one thing I don’t like about is the fact that he doesn’t have a nose. There are many villagers without a nose (Tangy, Punchy, Kabuki, Bunnie, etc) and I kinda hate that but still love them nonetheless.