I think you should add an extra service (like World Transfer Service) that grants your character a Fantasia Potion. Stylist in game content won't be enough to change some features of your character, like skin and height. Since I thought there was a Fantasia Potion every time you subscribe just one month I used it carelessy and now I hate my character. So if you want little changes you can go to the stylist paying with gil, if you want to change something bigger you can pay with real money.
I'm not the only one with this problem so I hope you will make Fantasia Potions purchasable someway...