It's a good response. The only thing you need is more examples that follow why you think Atticus is the most courageous character. Find some important events that include the character.
It looks perfectly fine the answer is well said and has supporting sentences to prove your statement. Wording is a little of where you said "but shows even more in the second half." It's not that big of a deal but just kind of rolls of the tongue weirdly not a necessary change but just thought I'd point it out.
