Do you have any tips for contouring beautifully without looking obvious?

I want to be good at makeup and look pretty, but I'm really bad at it.
I really don't like my face... It looks small.
By adding shading, you can create a natural sense of three-dimensionality.
Do you have any tips? Which color and brush would be best to use?
I would like to get help on how to express this more easily.