Eyes are the first bits to go from most stuffies. Usually it's not easy to replace them. Here are some tips on how to make eyes for stuffed animals.
Sewing a face on a stuffed animal - Making It Up as I Sew Along
Wholesale PandaHall Rhinestone Buttons Black Craft Eyes 100pcs 5 Size Shank Buttons for Eye Making Stuffed Animal Eyes for Amigurumi
Putting a Face to the Plush by Jacqueline Jolly
Just a PSA, safety eyes are not 'safe' and should not be used on items intended for babies or small children! : r/crochet
Simple Knotted Eyes for Soft Toys and Amigurumi - Tutorial
Craft Eyes Stuffed Animals, Stuffed Animal Eyes Noses
How To Make Eyes For Amigurumi Amigurumi Safety eyes & other options
How to Embroider Almost Perfect Amigurumi Eyes – Crochet Arcade
Fabric Eyes for Stuffed Animals - Sew Mama Sew
How To Embroider Eyes On A Cloth Doll
7 ways to make the eyes for your toy