I'm a fashion and portrait photographer primarily and I generally but not exclusively look for agency level models. For fashion work you should usually be no less than 5 feet 7 in height, good skin, slim and well proportioned.
I also shoot for various nude and erotic websites around the place. If you think you have a look that would work well for high quality nudes then please drop me a line and we can discuss it. For examples see Zoi's site which I've shot a lot of material for: Dreaming of Zoi
*At the moment I'm also looking to test with tattooed girls for Front, Bizarre style work. Also some interesting art nude work.
I am happy to test with agency represented models, time permitted or collaborate on interesting projects.
I go with the attitude that if I'm making money out of a shoot, the model will get paid, if i'm not and it's for portfolio, test or just for the fun of it, then they won't.
I don't charge for portfolio work, but am picky about who I'll do this for.
I'm the Editor in Chief of POSED Magazine which is currently in hiatus.