How do I pick a baby Pastel that will retain it's color

[loonunit]

Honestly I havnt seen very many SUPER impressive adult pastels.
my adult female I think is ok, not great but not the worst lol

Pastel Ball Python by zombiecupcake155, on Flickr

I mean she has some browning but in reality its just going to happen.

That's a plenty nice adult pastel! Some of them, you almost can't tell they're not normals. That girl is pretty obvious. When I look at her, I think "YELLOW". That's not shabby at all.