Oddly enough, little is revealed about the physical appearance of Atticus Finch. Perhaps Harper Lee has done this purposely so that the reader will focus on this man's character.
In some chapters, however, there are a few brief descriptions. For instance, in chapter 10, Scout states that Atticus is "feeble" because he is nearly fifty years old. He is much older than the parents of his children's classmates, and Atticus does not want to participate in such things as football. "I'm too old for that, son," he says when Jem wants Atticus to tackle him. Because he is nearly blind in his left eye, Atticus also wears glasses. Nevertheless, he is an accurate marksman.
It is in chapter 15 that a more detailed description of Atticus's face is provided. When the children show up at the mob scene, Atticus tells Jem to go home, but Jem does not budge. As they face each other, Scout narrates that she can see no resemblance between him and her father other than their resolute natures.
Jem's soft brown hair and eyes, his oval face and snug-fitting ears were our mother's, contrasting oddly with Atticus's graying black hair and square-cut features (Ch.15).
Atticus is tall because when he and Sheriff Tate arrive, Scout states that Mr. Heck Tate "was as tall as Atticus, but thinner." Scout goes on to say that Sheriff Tate has a long nose, implying that Atticus's nose is much shorter.