A decent rate would be $250 but if you want really good photos from a actual pro about $500.
This is someone with a studio. Makeup is additional.
If she is an average girl then I suppose average photos are fine.
Obviously a girl should get the best possible photos done but as we know that rarely happens.
I often shoot them for girls for free but only in trade if I need some shots of them for my art projects or web site headers etc.