Yes. The longer, the more formal is a good rule of thumb.
By the way, "air human" had me puzzled for a few seconds. FWIW, I was originally looking for the better-known "luftmensch", but it was taken so translating it into another Germanic language was the best thing left to do.
I feel like this example has jumped ahead a couple of lessons. What is this "mie imi este" construction where "este" is being used with the first person singular instead of the third person singular? Did we learn this yet?