Hear color

Lauren • Name is Lauren and Justin has my heart
So I'm getting my hair colored on Tuesday. Ive never colored my hair I've just had highlights. I'm going to go darker than what my hair is now. It's a light brown but my boyfriend says he would like it better darker and my hair dresser said it will bring out my eyes. I've had people tell me to go lighter because darker will flush me out. What do yall think?