There was always a possibility that Caitlin (the final name for the protagonist; the first several just felt wrong; but that's all in the future at this point) would have a drinking problem. A lot of likable people do. But in the actual writing that never came up and good for her. The other image was of a possible friend. She may have ended up as one of Caitlin's fellow dragon pilots.
Above: For those who came in late, my latest novel, The Iron Dragon's Mother, will be published in 52 days. To draw attention to this fact, I'm serializing the Image Book I made to help me imagine a strange world for the book.