I just talked to my aunt and she said she'll let her daughter (my cousin) paint her nails as long as the colors don't make her look mature like a teenager or an adult.

I'm thinking of getting my cousin pastel colors. What other colors should I get her? What colors should she stay away from? Are neon or bright colors okay for an 8 year old?
I gave my cousin a pack of nail polish last week, but her mother made her give it back to me and I gave that pack away to my niece.