stumble across an interesting post that explains why Iron Man got a schnoz on his faceplate. According to Jim Shooter (emphasis mine):
That was before my time. You know, Stan had an incredible reputation. I think people were always in awe of him and if he would say anything, just some little remark in passing, you know it would become law. I remember one time there was a situation — this was before I was Editor in-Chief — where Stan looked at a picture of Iron Man and said, “Shouldn't he have a nose?” I know exactly what he meant. What he meant was the guy had drawn the mask so flat that it looked like there couldn't be a nose under there. All he wanted was a little room for the guy to have a nose, right? Immediately they went out and drew a triangular nose on Iron Man's costume and it was there for a year or so. Then later Stan saw this picture of Iron Man with this triangular nose on his face and he said, “What's this, why is this here?” And they said, “Oh, you don't want that?” “Well, it looks kind of strange, doesn't it?” They took that as an edict, too — “No nose on Iron Man.” Then, they all walked around saying, “Gee, he changes his mind a lot.”So basically, Stan Lee was just pointing out something that I imagine a lot of people have pondered. I always thought the faceplate looked too flat and Tony's nose must be scrunched up something terrible in that thing. It doesn't seem to be a problem in the movies, where we can see Tony moving his face around a bit inside the helmet.