What colour (?) mutation is my Cockatiel?

[MyBirdIsDe]

So I'm not very sure if I'm using this website correctly or if this is how it works, but I'm not sure what specific colour mutation (is that what it's called?) my tiel is. He's only a few months old, from what the pet shop told me. If he even is a he, that is... anyway, I've just been wondering what specific colour mitation he is lately, but haven't been very good at finding out by myself. I can take some more pictures if they're needed.

 

[faislaq]