This is the original design of Airi (and I realized that Airi's hair is split on the wrong side in the other reference picture -w- yay)
Outfit: her outfit is white with blue as even a forced external rejection of her firebending side. She has been told and believes that waterbending is the superior element because not only is it water and ice, but it also heals. "Fire only destroys" as her mother would constantly say, destroying her daughter through her blinded disdain of rejection of her own firebender heritage. The necklace is Haya's betrothal necklace from her husband Zinan, and shows who Airi truly is and who Airi thinks she wishes she was.
Background: [link] Airi (c) Legend of Korra (c) Mike and Bryan
Yuan: Character and Simple Background - 400 yuan, Add +100 yuan for every character so 400 + 100(x4) (not counting Emi or the details) so 400 + 400 = 800 yuans (right?)