Write an article based on this "Straighten the ponytail more with a flat iron if you want a sleeker look. Use a toothbrush sprayed with hairspray to smooth down flyaways. Add a hair accessory if you want to match your outfit."
Don't undo the ponytail. Just grab strands from the tail, and run them through your flat iron. Your ponytail should already be relatively straight, so don't worry about being too perfect here.  Focus on the ends of your ponytail, especially if you have layered hair. You don't need to use more heat protectant, since the initial coating you did when you first straightened your hair should be enough. Those small baby hairs around your temples can ruin a sleek look, but luckily, they are easy to take care of! Take an old, but clean toothbrush, and mist it with hairspray. Then, before the hairspray dries, gently comb those wispy hairs down. If you don't have a toothbrush to spare, you could try a boar bristle brush or a smoothing brush instead. There are lots of options to choose from, from flowers to hair combs to be-dazzled hair ties. Choose something that you think will go great with your outfit, then add it in. It's best that you do this after you've finished spraying your hair, as hairspray can damage or dull a nice hair accessory.