Non-binary, like binary gender, isn't about how you look. After all, there are cis men who are frequently assumed to be female, and women who look masculine or dress masculine but are still cis women. Non-binary is about who you see yourself as.
Trans people who see themselves as women (or girls), full stop, the way we imagine cis women feel, are what we call binary trans feminine. Just as with cis women, they may have bodies that kind of look masculine, or dress in what we think of as men's clothes, or have deep voices, but they're still women. The same is true for binary trans men.
Non-binary is when neither of these really applies to you, and there are all different ways to not be binary male or female. I know some AFAB non-binary people, and they have non-gendered names and want to be referred to by they/them pronouns. My therapist is AFAB, but is "neutrois" -- no gender, but is generally referred to with she/her pronouns, I assume because in her profession, asking her clients to use they/them would be a bit much. She dresses in clothes designed for women, but generally not particularly feminine. Me, I'm AMAB, but though I live as a women, I don't say that I am a woman, because I reject society's gender nonsense (but have to live with it), but if I have to be taken as one gender or the other in my daily life, I'll take female. Hence, pronouns: "they/them or she/her."
There are also non-binary people who feel more male some days and more female others. Etc, etc.