The "true" Greek nose which you see in ancient Greek statues was almost always long and straight, but also had an unbroken line from forehead to tip.
Antinous, the lover of Hadrian, was considered the most beautiful man of his time, and had a perfect example of it.
I have no idea whether that nose was as ubiquitous in real life as it was in art or if it was an idealized, artistic choice.
In realistic ancient Roman statuary, where, in other words, they were doing realistic "portraits" in stone of real people you occasionally see the "Greek" nose, but with a dip at the eyes, not a straight line.
The Empress Vibia Sabina had it.
It's sort of like this, but with a definite dip at the eyes, not that straight line. This is a Greek statue of the Goddess Flora, btw.
I have a version of it. So does Richard Armitage in some of his profile pictures. However, full face Armitage does seem to have that "bump" or "thickening" in the upper third of his nose which you see in so many of the Roman busts.
Ed. The clay model seems to be of that modified "Greek" type.
That, for me, is the distinctive characteristic of ancient Roman noses: most are long, some a bit shorter, in some the tip bends down, in others it doesn't, but in most of the busts the nose has a distinctive bump in the upper part.
I hate to use something undoubtedly put together by racists, and thus highly exaggerated, but it does show some of the differences. The "Ancient Roman" nose, even when it curves, is not usually a Semitic nose.
Caesar in profile...Not all busts show the bump.
Cicero in profile
I agree with Jovialis. I think it came with CHG. After all, we're talking mainly about Republican and early Empire Rome.
As for "Jessica", she could be Italian or half Italian, or she might not. There are some faces that I almost always recognize as Italian. However, at the extremes of Italy there is overlap with neighboring areas. There's also overlap between some Italians and some Spaniards.
My favorite example is the skier Giuliano Razzano from the Apennines near my father's villages. He doesn't look out of place in those mountains, but he also wouldn't look out of place much further north.