Cockatiel Mutation?

[KingTiel]

Anyone have any solid guesses into what mutation Snowy may be?
Excuse the pink tail, its from his/her favourite perch. Quite a white chest and belly, White along the sides of each wing and then a light grey for the rest of the top half of its body.

Thanks everyone!

 

[HeatherG]

Female or juvenile white faced tiel?

 

[PrimorandMoxi]

Sweet little white angel bird?