Just be careful whatever you do. I understand that any decent agency will only require a standard photo and will not need you to spend hundreds on portfolios etc. Also I have recently read a few books about the modelling industry and have been shocked at what goes on behind the scenes, young models only 14 or 15 are plied with drugs and raped by the agency bosses. Only the top 4 or 5% ever get to earn any real money, some of the rest turn to prostitution to supplement their earnings. Some models are 'picked' by rich arabs to service them and their friends at private parties, some of these have disappeared when they protested over their treatment. Drug abuse is ripe within the industry as the pressure is so great to remain thin that the only way to do this is with the support of drugs to take away hunger pangs. What I have read is about the fashion industry and you are not necessarily looking to do that, but I bet they are all linked together, so please be careful!
Cheers, Sue