If you have a man who isn't taking great care of his hair, or is in dire need of a makeover, it may be a great idea to mention to him which celebrity hairstyles you like. If he doesn't seem to be paying attention, you may want to accompany him to his barber appointment and quietly suggest it to his barber instead, that may work better.
Now many people would use elastics but if you are going to use these then make sure that they are coated or covered in material such as scrunches for example. Once you have done this, you can stand back up straight and adjust your ponytail to exactly where you want it to hang from. Some individuals like a ponytail that will hang almost from the top of the head whereas others like it in the middle section of the back of the head and some even lower. This is going to come down to the type of look you want and if you are going to do anything further as far as styling with your ponytail