That little pearl is only the glans of the clitoris, btw. The entire length of the clitoris--mostly hidden beneath the, ah (scrolls down to review the educational diagram kindly provided by Dreama) "prepuce of clitoris"--is 4-5". And please don't forget to pay some attention to the vestibule, frenulums, and all the other fun surrounding parts

It's best not to zero in on the clit initially--warm her up first with some oral foreplay
If you want some serious education on dining at the Y, this is your bible:
http://www.amazon.com/She-Comes-Firs.../dp/0060538252
As Ian Kerner sagely puts it, "When it comes to pleasuring women and conversing in the language of love, cunnilingus should be every man's native tongue."