Does anyone know any anime characters I can cosplay as, has to have blue or green eyes, brown hair (chest length) and is a teen

Here you have an advanced search in which you can choose some settings like hair color, hair length, eyes color etc...

I'm looking to see if there is a website other than this or a specific character name

It all depends on what your budget and/or time left until cosplay is needed. Because if you're buying a costume, you'll have to factor in the shipping time and such.

Blue-eyed girls:
Hilda (Pokemon B&W Heroine), Aoi Seno, Ai Shindou, Alia Liese

Green-eyed girls:
Sailor Jupiter, Hungary, Chitose Aoba, Precis F. Neuuman, Chiharu de Lucia

Literally the first thing that came to mind was Eren Jaeger, except his hair is certainly not chest length. Perhaps genderbent Eren?