I think the only one "trick" to pleasing your partner orally is to listen to what she tells you and pay close attention to how she reacts. I often directly ask before we start getting physical.
I LOVE DATY and have been with women who love a hard tongue on their clit and women who can't stand it and need a soft broad tongue, women who love having me suck on their clit, and women who can't stand it, women who love fingers working their G spot, and (you guessed it) women who can't stand it, women who love a finger in the starfish or occasional forays with the tongue. If I have my tongue firmly in her starfish, then the bridge of my nose is usually against her clit. If I have a special move, the last one is it, I've had a few women who went wild with that combination, riding hard on the bridge of my nose while I tongue their bottom.
But back to rule #1, listen to your partner and pay attention to your partner's reactions.