How the very old man with enormous wings looked varies a bit throughout the story.
Some things stay constant. He is mostly bald, has only a few teeth left, and his wings look like buzzard wings . When he first appears, we're told he looks like a ragpicker.
However, as the story goes on, he changes a bit (and the other characters see more). The priest sees his wings have parasites. The old man's eyes get foggier, and he loses most of the feathers on his wings, then grows them back.
As far as quotations, there are different translations available, so those would vary, but you can get lines from the story's second paragraph, and from the last two paragraphs of the story.