I thought you guys might wanna look at this the different mutations of Cockatiels in the wild.You can see the White Faced tiel at the start couldn't tell what the others were.
https://m.youtube.com/watch?v=0jgvaCtWAt8

Its lovely to see them in the wild...
sometimes the flocks are huge...
Glad Ive seen them made my day when I did..

I can't see the whiteface bird. Sometimes the lighting makes it hard to see the cheek color and there's a hen in the very beginning whose face looks plain. But there's a moment where she turns her head and I catch a glimpse of a cheek spot. They say that you can spot mutations in wild flocks sometimes due to escaped pets breeding with the wild birds.

Yeah budgies too

They all look grey to me. From what I've heard, apparently grey cockatiels have a brownish tint when they're juvenile. I've never seen this in captive grey cockatiels, though.

You can see some sort of pied and a white face and normal greys

The coloring of wild cockatiels is slightly different from that of pet normal greys. It's usually assumed that splits (except for pied) don't have any effect on the color of the bird, but I get the impression that it does have a subtle effect. Breeders who are working on producing normal greys with no splits are reporting that the color is more like the wildtype.

I have a bunch of links to pictures of wild cockatiels listed here. You can see that the adult males are darker than hens/juveniles: http://www.littlefeatheredbuddies.com/w ... hotos.html