To get a modeling agency you have to think like an advertiser.
Not just How to Best Advertise yourself and what you can offer the modeling industry and your goals, but really and honestly what you have that an agency wants to see.
Thinking like an advertiser means thinking about ads and how YOU can be used in them and for what products you can model for.
If you do not have any shots of yourself that look like ads and involve a product like jewerly, a handbag, etc, then you should focus on creating them. Girls also often forget the importance of a smile and creating shots not just for the heck of it, but real modeling photos that show you modeling something.
Agents want to see this, they want to know you are sellable. So if you are a girl who is curious of being a model, then focus on creating shots that make you sellable.