A fishbone is a graphic organizer used to present information about a character (see www.lpg.fsu.edu).  If you are focusing on appearance versus reality, you need to select some subpoints where these things differ.  The number of subpoints can vary, but there will typically be 5-6.

To create a fishbone, you begin by writing the topic: Scout Finch.  Then you need to choose 5-6 appearances, and these will be splayed out of the fish like bones.

An example would be: Scout appears to be tough, but she is actually quite sensitive.

Scout is always fighting, but one reason is that her feelings get hurt easily.  She is particularly concerned with what her brother Jem thinks.

Jem was twelve. He was difficult to live with, inconsistent, moody. (ch 12)

Scout feels hurt when Jem seems to be not paying attention to her, or teases or scolds her.

You will need to provide a few more examples to finish your fish bone.