If you go onto the internet and search for noses crochet you will find a lot of suggestions. Several even have ones that you can sew on felt with s happy face; a sad face; or anything in between.
Personally, I dont like to put plastic noes or eyes on things I knot or crochet for children.......................:(
It is a beautiful and very complete doll, is so expressive ...
I like to use wire or crewel the nose, you can use the colors you want and make it the way you want :)