What is the physical appearance of Scout Finch?
There is very little on the physical description of Scout in the book. The reason for this is clear; she narrates the book. In other words, she does not describe herself. That said, we can make a few points.
First, Scout is probably big for her age. We come to this conclusion because she is bigger than Walter Cunningham, even though she is younger.
Second, Scout is also a tomboy. She likes to wear pants (breeches) instead of dresses. Here is a quote:
Aunt Alexandra was fanatical on the subject of my attire. I could not possibly hope to be a lady if I wore breeches; when I said I could do nothing in a dress, she said I wasn’t supposed to be doing things that required pants.
We should also mention that she was excited to get an air rifle for Christmas.
Third, even though these are not physical descriptions, it might help to point out that Scout is intelligent, courageous, and rash.
Scout Finch in To Kill A Mocking Bird is the narrator, so she doesn't describe herself. The only things implied about her physical appearance are her dirty overalls. She has bangs, is a tomboy, and does not like to wear dresses. A quote, if needed, that implies something close to a physical description would be "I could not possibly hope to be a lady if I wore breeches; when I said I could do nothing in a dress, she said I wasn’t supposed to be doing things that required pants," which she mentions when her Aunt Alexandra tries to transform Scout into a proper young lady.