Do you live in the US? I have come to the conclusion that perceptions about who is black and who is not has a lot do with culture. myself and family are light and freckled. Some have blue or hazel eyes, and some of my mom's siblings could almost pass, but we've always considered ourselves black without question. Yes we know we're Scot-Irish, Choctaw and African descent but my last white ancestor died right after the CW. The plantation was a long time ago. But when I talk my friends who are from Latin America, they all argue me down insisting I'm not black. I think the difference is in the US, in order to make Jim Crow work, whites supremicists made it if you are even a little black then you're black aka one drop rule. In Latin America it seems the general feeling is if you are even a little anything other than black then you are not black. Not saying everyone thinks this way but that has been my experience. My dad couldn't believe it when I told him people were telling me I'm not black. Not just Latin America. I saw a lady on YT who looks like me who said she went to Namibia and they told her she wasn't black. She was hurt because she was expecting this "return to the motherland experience."
I think the big problem with stereotyping of how "mixed" people look or even what kind of hair they have is that genetics can be tricky. So someone who has a parent of a different race may not look the stereotype while someone with an ancestor from 200 years ago does.
According to Dr. Henry Gates
58 percent of African Americans have at least 12.5 percent European ancestry (equivalent of one great-grandparent);
19.6 percent of African Americans have at least 25 percent European ancestry (equivalent of one grandparent);
1 percent of African Americans have at least 50 percent European ancestry (equivalent of one parent); and
5 percent of African Americans have at least 12.5 percent Native American ancestry (equivalent to one great-grandparent).