The nude lip look is a look which has been around forever. It always works, especially when you have a lot of eye-make-up on.
When I worked with Bella Brushes on a few projects, they also asked me to create those nude lips with their brushes.
When it comes to lips the base is really important. Just follow my steps shown in the tutorial attached and you will have nude lips which will last much longer than if you only applied the lipstick by itself.