What does Woodrow teach Gypsy about appearances in Belle Prater's Boy?

Woodrow teaches Gypsy that appearances are ultimately unimportant. As the old saying goes, it's what's on the inside that counts. Despite his being crossed-eyed, which tends to be somewhat socially disabling, Woodrow is very popular with the other students. This is because he has a winning personality and is able to head off potential bullies at the pass by joking around.
Gypsy, on the other hand, is always being judged on the basis of appearance, her extraordinary physical beauty—and boy, does she hate it! This is a somewhat ironic role reversal, to say the least, as it's normally the kids with disabilities, be they social, physical, or psychological, who end up being judged on the basis of their appearances.
Yet this is the difficult situation that Gypsy finds herself in, and by the simple expedient of changing her appearance—getting those lovely long locks of hers cut into a pixie cut—she hopes that people will accept her for what she is, not for how she looks, just as they do with her good friend Woodrow.