There are a few things you need before taking hair pictures for Instagram. First, make sure your hair is clean and free of any products that may cause it to look greasy or oily. Second, take a picture of your head with the hair down so that you can see all of the individual strands. Third, use a light source to create an even light across your entire head. Finally, use a tripod and hold the camera at an angle so that the light falls on your forehead in the center of the photo.