I definitely come down on the side of Jim basing his descriptions off of the characters who are giving them. As someone already said, Codex Alera and Cinder Spires do not go into the same level of description that Dresden Files do. In the Cinder Spires Gwen is described as small and doll like while Bridget is described as statuesque. Folly is only described by her clothes. In Code Alera Amara is described as tomboyish and all the watercrafters are described as youthful.
I think it illustrates Harry's focus, willpower, and determination. He has the mind of a teenager when it comes to women, but he is able to put that aside to deal with the situation. Summer Knight comes to mind when Harry is with Maeve in Undertown.