What is a good tip for your hair dresser?

I got my hair cut and colored yesterday and she did an amazing job! How much would be a good tip? How much would an average tip be? The total cost was $105 which included a shadow and an all over weave and a cut. I think $105 was a very good price.What is a good tip for your hair dresser?
Usually between 15-20% is what most people tip.

laser cartridges

under eye concealer