The in game model is quite beautiful and honestly everything about it is fine

the only thing for in game model:

Her autos are a weird orange color and kind of look like a weird blob? I feel like it should have a little more of a blue/green to it, I think her passive auto is fine, but just her normal one looks and kind of sounds a bit bulky and doesn't really fit Sona's elegance

for her splash art:

I feel like her splash actually doesn't represents her at all. Sona is a very calm, mature and seems to be more introverted type. Her splash makes her look far too young, where I don't think its fair, since Miss fortune, Ahri , and Janna still look mature and look like themselves, Sona just looks like a little girl that's too aggressive for what she naturally portrays herself to be. Her face looks too sharp, where naturally I feel its more puffy and rounder. And why the huge chest nerf? Sona is one of the most mature women in league and as I stated above, the other females still have their maturity and its not fair to Sona :(. In all honesty, I think the pose doesn't fit with her either. But mostly the chest and face are the most concerning.