Definitely curl your hair and wear a bright heel that stands out or a glittery heel Mine?
Maybe curl you hair and wear bright heels or flats! Do something like a pair of red shoes or blue, whatever you like but try to add some colour if you want. Whether it's the shoes or accessories. You could wear a bright fun necklace and wear nude shoes. Maybe don't wear black shoes since you're wearing a black dress and that might be a little overload for grad but your hair would look beautiful curled like how the model in the picture has it:) Congratulations on graduating!!
The necklace and heels the model shown is wearing would look good! (:
Read about it here check out third green color link for more info