Working as a freelance model means you can work with many agencies, it also means you can find your own work and you should. An agent can help keep your rate higher although you can also debate your rates depending on the freelance modeling job you find for yourself. Usually a magazine or the brand will set a standard rate though.
If you work with a magazine you get paid usually $150-$250.
If you work with showrooms you can make $200-$350 a day.
if you work with print ad campaigns or commercials you can make anywhre from $500-$10,000 or more plus royalities.
Modeling does pay but you have to target yourself the right way, with the right photos, and as a petite model it is best to be as commercial as possible.