My husband is a big guy. He has broad-shoulders, and is 6’2, 240lbs. But he has a very boyish face. His face is round, with large eyes, a proportionately small nose, and he has no visible Adam’s Apple. I think he’s very good-looking, but other people tend to call him “cute,” and not so often “handsome.” If it weren’t for DH’s size, he probably would have gotten carded until he was 40 and started to get some gray hair.
Conversely, I have a cousin who is not especially tall, or brawny, but he has a long jaw, narrow eyes, a broad brow ridge, a long nose, and an Adam’s Apple. In spite of being only 5’8 or so, he could walk into a bar without getting carded when he was 18. He is also good-looking, but you wouldn’t call him cute. He’s much more masculine looking from the neck up than my husband.
I have boobs for days. From the front, no one would ever mistake me for a man, but when I had short hair, sometimes I was called “Sir” from the back. I have a triangular shape. I have shoulders that are wider than my hips. My hips are really narrow, and part of the reason I had to have a c-section, probably. I used to lift weights, so my deltoids are built up, but even before that, I had a more mannish sort of proportion. In my 20s and 30s, when I was thinner, I could buy pants in the boys’ section.
So there’s some data points: shoulders wider than hips; Adam’s Apples; brow ridges; proportionately big noses; also bigger hands and feet, although I didn’t mention that earlier; square or rectangular faces, especially square jaws; proportionately small orbital openings-- men don’t have smaller eyes, they have bigger mid-faces, but the overall effect is that women have larger eyes.