I need a hairdresser's help PLEASE!?

Hey! so i've been browsing haircolors and i noticed Ariana Grande's hair is veryyy pretty! If I bring a picture of Ariana Grande's hair can the person doing my hair recreate the color even though i have already colored hair with roots showing ? and how would I maintain it to keep the color lasting longer. Like what products do you suggest i use? Please try to answer all my questions, thank you! <3333