It's time for some of my more extensive head canon, regarding Orianna.
The picture attached is what I pictured her to look like when she was alive. Her garb somewhat represents what the clockwork automaton looks like, like points at the end of the tutu. Another aspect that I imagined her to have was a very sunny personality, and one crooked tooth. (Also generally I pictured Piltovians to have English accents, varying from different districts in the city state. When Ori was alive, she is no exception to this... in my head) The gear hanging around her neck is a part that she took from her father's workshop when she was young and wears it all the time. Even on the automaton, Corin probably welded it there.
She also had a very good relationship with her father. They would do everything together, so of course he was sent into manic depression after she died. A void was left in his life, not having his daughter there with him, encouraging him to be a great inventor, them being a small happy family, her merely enjoying his creations, seeing her dance, etc.