You should make them understand that this course had good scope and now it is very much trendy. Try to say that fashion photographers are needed at present time and are demanded by many fashion industry. There thoughts don’t match with today’s scenario beacuse they haven’t seen any such occupation uptil now. You should try to make them understand, with your patience don’t shout on them, instead express your thoughts very politely. It will take time but things will change because we need to show our parents some examples. You can also share success stories of the other person who is making good figures with this income source. It will definitely help them to think twice before telling their decision.