Don’t just grab the first box of dye that says “Black.” Look at the color in the sun. Hold it next to your arm. Does it make your skin look sallow? Does it clash with your eyes? Test a strand first (or use a semi-permanent rinse if you’re scared).
And for the love of good lighting, ditch the idea that black hair has to be flat. Add a gloss. Use a blue shampoo to keep brassiness away. A little shine in black hair is like a little sparkle in a diamond—it makes all the difference.