i do all sorts of photography so i don't even specify. if you have business cards with photos for each on it. like on moo.com you can split up your cards between different images, i would have a box of cards for children photography, then some with an example of high school seniors, then one for weddings. so i can hand them out accordingly. if they want to know if i'll do maternity photos or boudoir photos they can just ask. there's really no point in listing all the things you photograph..which is why i suggested something like:

Crystal Collins
Fashion & Portrait Photographer
crystalcollinsphoto.com

or something easy like that.