They look like regular nipples, just stiffer and pointier. They'll stick out from the breasts more. If she's wearing a shirt with no bra, you'll be able to see the little points sticking through the shirt.
If you want to see a pretty accurate picture, and you think that you can handle it (warning, this picture is X rated!), click on the link below:
http://tribes.tribenetwork.com/clitlovers/photos/5d60ca6a-4669-4702-8b4d-bf7f360578b3
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