This post will give you a good look at one of the many things that goes on behind the scenes. If you played V0.2a or read the patch notes for V0.3, Aurelia got a redesign of her visuals. Let's first discuss the intent behind the old one, and then what was wrong with it.
The intention was simple: an anxious person, usually looking distressed when outside. Her color scheme was set as red on white with pink hair, as I quite liked that look. I also wanted her to have a skirt to distinguish her further from her previous peers.
The issue was, that her appearance was a bit too young for my liking. One of the reasons is, that breast size directly correlates with age in an anime artstyle. And having her as the inexperienced virgin in the story did not help this issue either. It was also brought up to me, that her outfit, which I kind of grew to like, looked like a school uniform. As that was never the intention, I didn't even notice this until it was pointed out to me.
So, what made this character young? The breast size, the outfit, the posture and the hairstyle (which is typically associated with school girls in manga). Her posture is something that is dependant on her anxiety, but the rest were adjustable. And this change was necessary, since we will see Aurelia with quite a lot less clothing in V0.4. So I went with a tripple pronged approach.
This is her new version and the one you see in game. As you can see, her general color palette did no change, neither did the intention behind her posture and attidute. I myself am very happy with the new version. There is another character in the game that might get a visual overhaul too, but doing so is honestly quite a decent chunk of work.
I will leave you with some direct comparisons between her new and old version.