Man, Jules has changed a lot over the years. She was originally going to be a villain, I don't think I ever told anyone that. Then she was going to be Victoria's boss, then partner, then suddenly lover.
After that the story kept evolving and changing and turned more and more into what it is today. This was one of the final changes to Julia, something I believe Max came up with. Since Julia had her arm torn off by a werewolf during initiation, why not give her slightly wolfish features? Little remnants of wolf to her, like the fangs and her hair raising (and looking a bit like ears) whenever she get's excited/angry/scared. She's had a couple changes since, like skin tone (and one other that's a bit of a spoiler so I'll leave that for the comic itself to tell) and I dropped the blonde tips to her hair.